Necrotisis' Guide to CSing Senna ADC



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Quick Senna AD ADC Build

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Summoner Spells

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Starting Items

Best Overall Build

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WARNING: The above section is updated with what I am currently playing in 13.10. However, the items section below is not up to date. I am in the middle of looking at all the changes and testing a bunch of the items. The general ideas below are still fine, but the specific item advice could be anywhere from basically fine to completely incorrect until i test all the items and update it. I am also probably going to wait to update this until they are mostly finished balancing the changed items, so it will probably be patch 13.13 or 13.14 before I can update this without needing to worry about it changing a week later.

Important

This guide is for CSing Senna adc. If you want a Senna support guide, this isn't the place, although the things I mention here may apply to Senna support.

The runes and build shown above is the most generally applicable build for Senna ADC. There will almost always be something better for each individual game, but that rune page will do fairly well in most games if you would rather avoid learning the purposes of each individual rune and swapping between every game.

You may also find a rune page that you prefer generally, I personally use a page that fits my playstyle better (you can find it at the very bottom of this guide, I try to keep it up to date for whatever I use currently), so I would recommend trying all the options before you settle on any given one.

Due to your Q healing you, some lanes may not have the damage to force you to buy a potion. In contrast, some heavy poke lanes may require you to go Longsword + 3 Potions. I would personally recommend you try Longsword + Refillable Potion until you have a handle on which lanes you need more or less sustain in, and then adjust the potions you start within for the matchup. In some games, you may need one or no potions, meaning you could reasonably start cull in that matchup.

Best tip for Senna, get souls as much as possible, with two autos whenever its safe or auto + Q if that's safer. Any missed opportunity to auto twice for free is a missed soul, and they do add up very quickly. You will perform better if you collect more souls from trades (Note, some lanes you're gonna just not be able to get many souls against, commonly very high range opponents. This isn't great for Senna, but there isn't a ton you can do.)

Why play Senna ADC?

As long as you CS better than your opponent, you will always hit your items faster than them. However, on Senna the effect of this is magnified by her passive. Souls that drop randomly are worth 8 gold on pickup, and the stats they give are also worth a lot.

While souls collected from trading with enemy champions do not give 8 gold, they have an average gold value of 44.55 gold per soul. This is RIDICULOUS, even more so for souls you collect randomly because they are worth 8 gold on top of that. Of course that gold value should not be taken at face value for two reasons. Reason One: That gold value doesn't actually include the range, as there is no basic item that gives range to compare the stat to. This means they're worth even more than the average. Reason Two: The word average is very important there. You only get the 10% crit chance and 20 bonus attack range every 20th soul pickup. This means that the value of souls 1-19 is 26.25 gold. This is still really good, but not as good as the 44.55 from above. The 20th soul (and every multiple hereafter) is worth a whopping 426.25 gold because the 10% crit chance is worth 400 gold. This is, again, not including the range, which makes each multiple of 20 insanely valuable. If you're going to be fighting and are close to a multiple of 20, try to get that 20th soul before the fight. I would also like to note that the value of souls goes down once you're at 100% crit chance, because the value of lifesteal is less than the value of crit chance.

Now it is smart to keep in mind that you aren't getting AD per level, therefore you have to get a certain number of souls every level to match the enemy adcs AD growth. The average AD per level for adcs is around 3.2, and the average starting ad is around 58. This means you need to have 10.667 souls to match their AD at level one, and about 4.267 additional souls to match their ad for each level after that. This means that, throughout the early levels, you will be weaker than most marksmen, but as the game progresses your AD from souls starts to outvalue their AD from levels (not even including the crit chance) as long as you are collecting enough souls. In a perfect world you would have 32 souls as you hit level 6 to match them, but for this you need to be getting something close to 5 souls per minute, which isn't possible in every matchup, and is mildly difficult even in the matchups where it is possible. To be fair, you have more total gold value than they do as long as you're either up cs or going perfectly even. A boring lane where nobody dies is better for you than it is your opponent in most lanes, which means your opponent generally has to commit their resources to engaging onto you or your support. Keep in mind that you do need to be aggressive enough that their support doesn't feel comfortable perma roaming, as this is a very easy way to lose the game easily. If they do roam, you should be able to fight the opposing adc 2v1, or at the very least you'll be fine 1v1 long enough for your support to counter-roam. Note: The 20% AD on-hit damage from your passive does help to even this out, but your attack speed is a good chunk lower than the average. You probably won't be as weak as the section above is implying, but you do need to be careful because you are definitely weaker in most matchups for a few minutes.

If you don't enjoy hyperscaling, dont play Senna, and especially don't play Senna ADC. You will find her boring compared to someone like Kai'Sa, Tristana, or Samira in lane, and her late game teamfighting isn't nearly as 1v9 DPS monster as someone like Sivir or Jinx. The tradeoff is that you're hitting items quicker and you start popping off much earlier than the average hypercarry, without falling off much in comparison to hypercarries late game. Strangely, I often find that I'm stronger than most hypercarries even when everyone hits full build, because Senna is still scaling and grabbing souls, especially if you no longer need to be killing the minions, as that will give you a drop rate more similar to Senna support.

People like to think massive range is the main draw of Senna, and while this is true to some extent for Senna ADC, it is much more applicable to Senna support, especially since other late game focused ADCs can get high range much more consistently (ex: Jinx, Kog'Maw). You do definitely outrange most champions in lane though, meaning you can often look to trade without your opponent getting a chance at trading back, but if your goal is just to have absolutely insane range, some of the other options might be more consistent.

Rune Pages

Below is a rune page with Fleet for each subtree (except domination), and one for First Strike with precision second. The Precision main-tree pages are all assuming you're going a Kraken build with BotRK. If you're going something else, you should likely consider running legend: bloodline over legend: alacrity.

• Fleet/Inspiration
• Fleet/Resolve
• PTA/Sorcery
• First Strike

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Note, these pages are not always the best, sometimes minor adjustments are good based on your team, the enemy team, or your personal playstyle and preference. The most viable changes are listed below in no particular order.

Primary Tree

Keystone: Take Fleet Footwork into lanes where you want the movespeed to help kite and the sustain to help your lane. You have 600 range at the start of the game, and so you can absolutely get a lot of healing out of it. Take Press the Attack into lanes where you have an engage support and you will want the extra damage for all-ins. PTA also in my opinion scales better, as the damage increase is generally more useful than fleet late game and can enable you to burst people with aa + Q + aa. You don't generally have enough time to stack Conqueror and Lethal Tempo is just not worth it to Senna, the attack speed is not that useful and the 50 range takes too long to stack up to for it to have much value.

Overheal versus Presence of Mind: If you plan on going a tear item, or just are very good at managing your mana, you probably want Overheal. The extra durability of the shield is nice and Senna doesn't struggle to keep it up a lot of the time. However, I personally feel Presence of mind is better, as in a lot of games you'll run out of mana during lategame teamfights without the mana on takedown effect of presence.

Note: Presence of Mind does not help your mana in the early game very much unless you are getting takedowns. The mana regen on damaging champions is a really small amount, roughly 4-16 mana across the entire 4 seconds from levels 1-11. If you struggle with early game mana and need a solution other than conserving it, you have a few options. You can start tear or purchase it on an early back. This will leave you relatively weak in the lane, limiting your impact until mid-late game, but the extra mana from tear will help you sustain with extra Qs. Against any lane that isn't likely to kill you in lane, you can go tear and play to outscale them. If you want mana and are playing against an extremely poke-heavy lane, start dorans ring. The AP on ring will turn your adaptive force from absolute focus (if you have it) and the two rune shards from AD to AP, making your heal on Q stronger at the cost of your DPS. The mana regen on ring is also very strong. Between the increased heal and more mana meaning more Qs, you can out sustain most poke lanes (especially since you get 2 potions with dorans ring). Eventually you will buy more than 15 AD and your adaptive force will swap over back to AD, but until that happens you will be lacking in damage.

TLDR: If you are either buying lifesteal or okay with getting it later, go alacrity for the extra damage. If you want lifesteal earlier on in the game, take bloodline. Legend: Bloodline versus Legend: Alacrity: Bloodline is very strong. You want the healing on each autoattack and your Q applies lifesteal to everything it hits, which can make your self healing ridiculous later in the game. In regard to alacrity, while i still personally it's a terrible rune for Senna, amounting to about 0.072 attacks per second at the full 18% bonus, alacrity has become more viable than ever before for Senna adc. Yes I am aware that it's slightly better than half as valuable on Senna as it is on the average marksman, I just think most builds benefit more from the lifesteal of bloodline than they will from alacrity, since lifesteal is rarely built. However, each build of Senna has ways to get lifesteal outside of this rune tree. Blade of the Ruined King is a strong option for Kraken Senna, and even without that you tend to go over 100% crit around 3.5 items, which turns your excess crit into lifesteal. Lethality on the other hand, while not building lifesteal, has less need for it due to lethality increasing your Q heal. As much as I'd like to stick to my previous thoughts and say alacrity still sucks, with a bit of testing and some thought about where else you can get lifesteal, alacrity has gotten better and bloodline has become less necessary. Honestly at this point it is down to personal preference, and whether or not you care about having lifesteal before 100% crit if you don't plan on building it.

Cut Down: Do not replace this unless you are planning on building max health items. My Cut Down often does more damage than my Kraken Slayer, commonly doing upwards of 1,000 damage every 10 minutes in most of my games, with the ones going past 30 minutes being even higher than that. This is because Senna has one of the lowest Base Health (and health growth) stats in the game, and of the lowest Base Health champions, she is the only one who does not need to build health in her core items, as the rest are all either enchanters, with mythics that all have at least 200 hp, or unmounted kled. This means that you will ALWAYS have the lowest maximum health in the game (unless you're very ahead in levels, in which case you're already winning) and you will get at least some damage out of cut down against every enemy champion. Yet another reason Cut Down is strong on bot laners is that they generally are lower level than most other people on the map. This means that you will have less max health from levels and therefore get even more damage out of this rune.

Some people like to go First Strike as a Keystone, and while I personally think it's not worth it, there are a few runes you can viably swap from the example page: The second row of inspiration, since all three options (Future's Market, Minion Dematerializer, or Biscuit Delivery) are viable, this ends up being mostly personal preference.

Secondary Tree

Personally I always go sorcery, although I'm staring to think I should swap to inspiration.

Absolute Focus is insanely good for Senna since you're almost always above 70% health, and it makes your autos do that much more damage (Note, because you have such low max hp, your Q healing and lifesteal applied on it easily keep you above the 70% mark).

Gathering Storm is the second best rune you can take on Senna ADC, beaten only to Cut Down. It makes your scaling insanely consistent and is worth a ton of damage as the game starts to go later and later.

I have been considering Transcendence for games where you would want boots other than Lucidity in build that would otherwise be lacking in ability haste. While I do not personally have a ton of games with this, it does seem to work as a viable strategy.

Celerity and Nimbus Cloak can be viably swapped (generally instead of Absolute Focus) if you want slightly better movement speed in general or movespeed on escapes using summoner spells respectively. If you go Celerity, it may be smart to consider going Youmuu's Ghostblade and/or Phantom Dancer in your build, as the movespeed stacking will make you difficult to pin down. Celerity in my opinion is best paired with a Duskblade into Youmuu's core build with swiftness boots, as you end being incredibly fast.

If you want to go resolve, you're generally doing it to take Second Wind and Revitalize to help with a scary lane (in this case, it is also worth considering a Doran's Shield start instead of cull). However, Conditioning is also incredibly strong if you want those extra resistances for a moderate increase in your durability. Of course, due to Senna's aforementioned low health total, the extra resistances aren't worth as much to her as most other champions.

While inspiration is popular, personally I don't ever take the tree. Approach velocity is nice but generally overkill as you would catch most people anwyays just with your Q's slow. If you want magical footwear for the free 300 gold value of tier 1 boots, gathering storm or conditioning is generally more valuable for you anyways, making inspiration just not a valuable enough tree in comparison. (Note, Senna support generally does want insp, mostly for the free boots, as in that role the 300 gold is worth a lot more because Senna support has less access to gold).

If you for some reason aren't running precision as your main tree (i.e. you're playing a First Strike build), your best options are some combination of Overheal, Presence of Mind, Legend Bloodline, and Cut Down.

Rune Shards

Adaptive Force, Adaptive Force, and Armor is generally the best into most lanes. Into enemy bot laners who are playing mages, like veigar or cassiopeia, you will obviously want to go Magic Resistance instead, but it may also be worth going Adaptive Force, Magic Resistance, Magic Resistance because that +16 MR will save you a lot of health in lane, especially if the enemy support does mainly magic damage. Against some lanes it is sometimes viable to go Adaptive Force, Armor, Magic Resistance, as the resistances will save you a lot of health in lane, which makes it more difficult for the opponent to force you out of lane or all-in you. Double Armor is almost never worth it since Senna (alongside most ADCs) has fairly good armor growth with level, so the difference there is negligible after around level 4 or 5.

The 10% Bonus Attack Speed rune is terrible for much the same reasons I have recommended against Lethal Tempo (and in the past, Legend Alacrity). 0.4 Attack Speed Ratio multiplied by 0.1 (10%) comes out to 0.04 attacks per second. That is 1/25th of an attack per second. Even inlcuding how it factors into the Q cast time, it's negligible at best. The attack speed isn't literally awful, it is just not worth nearly as much as the adaptive force, since that has better benefits for all of your abilities and your passive 20% ad bonus on-hit. Note: Some people say it's worth it because autoing reduces your Q cooldown, and while that is true, if you really want a lower Q cooldown take the ability haste shard. 8 ability haste is a much better way to reduce the Q cooldown because the flat cooldown reduction on-hit for Senna Q is 1 second, instead of being a % of the total or remaining cooldown. This means that the 1 second reduction is a higher portion of the overall cooldown, thus making each attack worth more for reducing it. I actually often do take the ability haste shard in builds where I know I'm not going to be able to grab very much ability haste.

Summoner Spells

As usual with most bot laners, you are generally expected to take heal, which is useful because of its self peel capabilities, as well as being able to save both you and/or your support. This is also by far the easiest summoner spell to use.

I personally find Barrier to be numerically stronger than heal with the new durability, but you're lacking the ability to save your support (and you're lacking the movespeed, which is commonly worth more than the extra durability of barrier. Heal is also easier to use, as excess healing doesn't expire the same way shielding does).

If you need to survive an assassin or a very fast champion (think zeri, jinx, kennen, etc) exhaust is a lifesaver. It allows you to create distance to start kiting if they close the gap or just reduce their damage to save your life.

Cleanse is only really strong if the enemy team has a lot of cc that you will have a difficult time dodging. This is notably champions like Leona or Pantheon who have point and click CC. Cleanse is also strong if you're worried about exhaust and/or ignite, as it cleanses summoner spell debuffs. I will highly recommend that if you're playing against an Ashe (adc or support) or a Varus that you take cleanse, as their ultimates are a huge part of their ability to fight 2v2, and just having cleanse will make them a lot more hesitant to even attempt it.

Ghost can be good if you're building a lot of movespeed, playing in a teamfighting comp, and not worried about lane. Personally i prefer to just build ghostblade, as ghost can leave your early game too weak to stop the enemy from just engaging on you or your support and fighting 2v2. Note: It is quite fun to take ghost and build Duskblade, Youmuu's, and Boots of Swiftness. This is even more fun if you swap Absolute Focus with Celerity. If the enemy does not have point and click crowd control, you become almost impossible to catch. Definitely overkill, but also incredibly fun.

Teleport is good if you're aiming to just not go down cs in a lane where you're expecting to be low on health and mana fairly early. This summoner is also really good if you expect your support to roam a lot, as it makes you more self sufficient in lane.



Skill Path

• Standard

Senna

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Items

Currently this section of the guide is being updated actively by me! Currently, everything item related below the % pen section found a few paragraphs down will soon be updated into a more concise format, with some items being added as I test new ones.

Mythics

Kraken Slayer: Generally your best damage mythic. It is the best option for killing tanks and bruisers and the true damage scales with bonus AD, making it incredibly strong.

Duskblade: Weaker lategame, stronger lane. The early lethality allows you to snowball in lanes where you need to play aggressive. The ability haste also allows you to go swiftness boots. Overall, this is much better than Kraken in terms of mobility. I recommend that you build duskblade in any game where the enemy team will greatly outscale yours, since at that point you need to win early in lane and get a lead while your teammates are still useful. The only time Duskblade isn't hard outscaled by most Kraken variations is if you are the source of most or all of your teams physical damage, as that means the enemy team will likely be building magic resist.

Eclipse: Generally not as good as Duskblade. While it is now better because it has Ability Haste instead of omnivamp, and the cooldown is lower than it was, I still prefer Duskblade because it has more haste, more lethality, and in my opinion a better passive. The only real upside is the % armor pen mythic passive, but LDR and Serylda's are both great on Senna, making this less impactful, while Duskblade's ability haste from the mythic passive enables you to go swiftness boots and other items that are lacking in haste, since you can get much more of it from your mythic.

Immortal Shieldbow: Honestly not that good? Any time you need the shield it is because someone is on top of you, and someone being on top of you means the shield will not be enough to save you. This is also a LOT less damage than everything else, you're really not going to be strong enough to impact your games until hyper-late game, and at that point they're generally already won or lost.

Galeforce: The dash can be good against some teams, but Duskblade is in my opinion much stronger in terms of mobility. Galeforce dash can have a fairly good amount of damage on it, since it does have a bonus ad scaling on it, but that is hopefully not the main reason you're building Galeforce. The biggest issue is that the dash doesnt take you far enough to create the distance you would want against a lot of the enemies who can get close enough to make you dash in the first place It has potential to be very useful and has strong outplay potential, but honestly, with lower DPS than Kraken and worse consistent movespeed than Duskblade, the dash doesnt do enough to make it feel worthwhile.

Ability Haste

Boots of Lucidity: These are the boots i use in a majority of my Senna adc games. The 20 ability haste is insanely strong for Senna, since it means you're getting more Qs, which means more slows and more healing. The summoner spell haste is also nice, as Senna likes having flash up as often as possible, especially for large teamfights.

Other items: Pretty much anything with attack damage and ability haste on it will work here, I'm not about to list every item that has AD and haste, you can figure that out. In general I recommend to have ~10-20 haste in your first item and boots, and ~30-40 by the time you're at full build. Anything past 40 is starting to lose a lot of value, as ability haste tends to be worth less the more of it you already have. As long as you have at least some (about 20), you'll be okay.

Transcendence: While not technically an item, I am including this here because it can be useful. Replacing absolute focus with transcendence allows you to go a first item and boots with no ability haste on either without giving up on ability haste entirely in the early game. Even with transcendence you're likely going to want to get 20-30 ability haste from your 3rd, 4th, and 5th items, but this way you can go for a core build that lacks haste.

Note: The main reason I go Lucidity instead of Swiftness in most of my games is because I build crit. This means that to achieve 20 haste with my first item and boots, I have to get it from boots, as neither Kraken nor Blade of the Ruined King has any on it. Therefore, Boots of Lucidity are a very important source of early-game haste for crit Senna.

Kiting Items

Blade of the Ruined King: An item i previously dismissed as only strong against high health, low armor enemy teams. I was wrong, and very much so. Blade is an insanely strong item for Senna for a number of reasons: The early lifesteal helps you keep your health high, the damage is pretty insane between the on-hit and the 40 AD, but the real value of this item for Senna comes in the movement speed steal. This allows you to kite insanely effectively and is strong for the same reasons as old glacial augment or frozen mallet.

Stormrazor: Another option for kiting, and one that was recently buffed with 5 ad. This item has been strong for awhile, but it is low pickrate because the slow is just not particularly useful for a ton of champions in every situation. Senna though, can almost always make use of the slow due to her high range. It's less damage than Blade's passive, but it does have crit meaning your Navori, Guinsoos, or IE will be stonger sooner. The energized is also up more often, which can be incredibly useful. Personally this one is my preference, but Blade of the Ruined King is almost definitely stronger.

Phantom Dancer: Yet another option for kiting. Having tested this in 13.3, it felt insanely good and the consistent movespeed functions pretty similarly to the active of Youmuu's. With the attack speed ratio buff in 13.4, this item will be even stronger than when i tested it, making it quite valuable.

Youmuu's Ghostblade: Generally a great second item for Senna, the movespeed passively is helpful for rotating faster, the active gives you more movespeed within fights, and the AD/lethality are both good stats for you damagewise. A strong choice even if the rest of your build isn't lethality.

Boots of Swiftness: These are the boots you go if you do not need the haste from Boots of Lucidity. If you're already on track to hit 20 AH with your first item, and 40 by your third, then you'll probably be better off with the movespeed from these.

Crit-Modifier Items

Navori Quickblades: In my opinion the strongest crit-modifier item for Senna adc. It gives you about the same amount of damage as Infinity Edge does overall, but Navori also gives ability haste and on-crit cooldown reduction. This item also benefits a lot from Senna's passive souls, which allow you to have higher crit chance sooner, giving her access to more damage from this item earlier.

Guinsoo's Rageblade: Honestly this item is also quite strong for Senna, as it is the best item for Senna to turn souls into DPS. However, CSing Senna adc does not get as many souls as Senna support, and relies more on gold for her damage instead of souls. This means that, while Guinsoo's is strong, it will only be worth buying if you have a lot of souls, relegating it to 4th or 5th item for CSing Senna. The attack speed on it just isn't very gold efficient for Senna, so until you have enough souls, this item doesn't do as much as Navori or IE. With the ratio buff in 13.4, this is definitely the item to go if you're not going a crit modifier until 5th item, and if you're not building attack speed for most of your other items, this might be a good choice.

Personally I prefer Navori in crit focused builds and Guinsoo's in lethality builds, but with the new buffed attack-speed ratio Guinsoo's is definitely best in lethality builds and its probably preference between this and Navori for crit builds.

Infinity Edge: Generally the worst crit-modifier item for Senna. The total damage is basically identical to Navori, but with Navori, a higher portion of that damage comes from your Q, meaning you will get more slows and heals into your rotation. Navori also gives you a lower cooldown on the rest of your abilities and gives you higher access to W with the cooldown reduction on-hit. Overall there just isn't any reason for Senna to go IE over Navori or Guinsoo's, as there are very few scenarios where it is a better item for her.

% Armor Penetration Items

Lord Dominik's Regards: One of your two options for % pen for ADC Senna. Due to the recent change to it's passive, as well as Navori making crit chance worth more as a stat, LDR is insanely strong for Senna right now and in my opinion the better option.

Serylda's: Your second option for % pen. If you don't plan on going any crit modifier items, this is still a very strong option as it provides AD, % pen, and CDR which are all very good stats for Senna. The passive slow is mostly wasted on Senna though.

Other Luxury Items

Umbral Glaive: This item doesn't feel super amazing. It's a good rush in lane if you plan on building Duskblade or Eclipse second into mostly generally full lethality/armor pen, but overall it scales into the mid game really poorly due to lethality being a much more valuable stat when you're up levels on your opponent, and as a bot laner, that is almost never the case.

Manamune: Weak until it's completed, but generally your best item to turn gold into damage. In general you should not start tear, instead buy it on your first back. It is a viable start against some very heavy poke lanes where you can use Q to sustain you and your support. You should only really be buying Manamune in games against late scaling hypercarry adcs, as while this is quite possibly Senna's most gold efficient item in terms of damage per gold, it also is incredibly weak early and in most matchups you'll lose the game before you can scale up. Personally I love building this on Senna, but it's not recommended for ranked because it'll take you far too long to significant damage, which heavily limits your ability to impact the game. Very strong for clash though, if you have a team who's willing to play for late and cover some of the early weakness, or just a team that is willing to have a below average DPS bot laner for the first 25ish minutes.

Gargoyle Stoneplate: Stoneplate is the best option for Senna ADC for improving your uptime in teamfights when you literally just need resistances and already are doing enough damage. It gives both types of resists, and has no health attached, which is nice for your cut down. The shield is generally useless and it's not that great, but it works well enough when you need armor and magic resist. Most of the time Maw and your base armor will cover your survivability fine if you space well, but there are definitely some times where you need both the large amount of armor and the large amount of magic resist more urgently than you need more damage.

Maw of Malmortius: Good second item into magic damage heavy teams. In my experience Maw has performed better than Wit's End due to the ability haste and the lifeline being stronger for Senna ADC than the attack speed and on-hit.

Deaths Dance: Similar to Maw but for armor. It's generally rare that you build this, as most of the time you have enough base armor to be okay into all but the heaviest AD teams.

A note about Guinsoo's Rageblade & Rapid Firecannon: In my opinion, RFC isn't a particularly good item for Senna ADC. It is much stronger with Senna support, where your damage isn't as reliant on your items because a majority of it comes from souls. This is magnified by the idea that not only is Rageblade also much stronger on Senna support, but purchasing Rageblade makes your damage even more reliant on your souls for two reasons: Every third auto doubles on-hits, meaning it turning crit chance from souls into an on-hit makes it more valuable the more souls you have (which is better for Senna support). And your passive 20% bonus ad every attack is an on-hit, meaning this is also doubled every third auto. It is an extremely gold efficient item for Senna Support and it's value there comes from the higher soul generation and the item's gold efficiency because of said souls. Senna ADC however, has far fewer souls, making the item a significantly worse purchase for her. RFC does have some games where you want that extra range and are willing to sacrifice damage for it, but most of the time the amount of damage you lose buildling an item that for her is almost entirely utility (her low attack speed ratio makes the 35% attack speed about half as valuable as on any other adc, meaning you build this more for the movespeed and range) will make you worthless as an ADC because you'll tickle the enemy team. Guinsoos can be a worthwhile item on Senna adc, but generally you'll be building it near the end of the game when you have a ton of souls and at that point the game is probably already won or lost. If you're going to be 80+ souls when you finish this item, its probably worth it. Otherwise, Navori might be a better choice.

Boots

Lucidity is usually your best option, especially if you're going a crit build. Because Senna relies on her Q (and other abilities) a lot, and has long base cooldowns, the 20 ability haste functions similarly for her in comparison to Berserker's Greaves for a more standard ADC.

Alternatively, Swiftness is great for kiting and keeping a distance, and plated/mercury's are also both viable into heavy auto-attack or crowd control enemy teams respectively.

I believe that the movespeed on swiftness is insanely valuable to Senna's surviability, but if you are lacking in AH you definitely need lucidity, but if you're not, definitely prioritize that extra movement.

Thank you for reading!

As a final note, this guide is actively being updated by me as I play more and more games of CSing Senna ADC. If you're planning to copy the item sets and rune pages here exactly, I would recommend checking back every once in a while to see if anything has changed. If you're curious what I personally am running/testing currently, I'll try to keep the set of runes and items below up to date. It probably wont be very exciting or experimental most of the time, since this is the build I am actively using to climb.

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Quick Senna AD ADC Build

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Summoner Spells

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Starting Items

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Best Overall Build Oh and remember: I am not all knowing, you may disagree with some of the things I've said in this guide (And it's easily possible I'm wrong). Feel free to leave comments voicing your disagreements, and hopefully we can reach a correct conclusion about what is best together.