Kai'Sa ADC Build & Guide — Patch 26.18

Overview

Kai'Sa is a hybrid marksman — a champion who scales with both AD (auto-attack damage) and AP (ability damage) at once, instead of stacking only one. She is the only ADC (attack damage carry: a ranged auto-attacker that becomes the team's main damage source late) whose abilities literally upgrade themselves when you cross hidden item thresholds: 100 bonus AD evolves Q, 100 AP evolves W, 100% bonus Attack Speed evolves E. Her build path matters more than for any other marksman — wrong order means an evolve never triggers, and a Kai'Sa without evolved E (no invisibility on the dash) is half a champion.

Her game plan is a stacking puzzle: every basic attack puts Plasma stacks on the target, and the moment a target is carrying Plasma her R unlocks as a long-range dash on top of them. Support CC (Crowd Control: stuns, slows, roots that lock the enemy in place) accelerates the count for free. In lane she pokes (deals long-range chip damage to drain HP without committing to a fight) with W at 3000 units; in teamfights (5v5 fights that decide objectives like Drake or Baron — neutral monsters that grant team buffs when killed) she sits at maximum AA range until a back-line target is chip-killed, then dashes in with R + evolved E invisibility to clean up. The skill ceiling sits in R target selection.

Recommended Build

Starting items: Doran's Blade (small AD + lifesteal — heal a portion of damage dealt) + 1 Health Potion.

Core items (in order):

1. Kraken Slayer — first-item power spike (the moment a champion gets noticeably stronger after completing an item). Gives AD + Attack Speed; the Bring It Down passive deals bonus physical damage on every third hit, scaled up by how much health the target is missing, which front-loads damage during the short R-into-fight burst window.
2. Berserker's Greaves — attack speed boots, raised to 30% bonus Attack Speed in patch 26.16 (from 25%). On top of Kraken Slayer's 40% that is 70% from items, still short of the 100% bonus Attack Speed that evolves E: 70% only clears the bar at level 18, once stat growth has quietly supplied the last 30%. Buy them for the DPS and the head start on the threshold, not because they finish it.
3. Runaan's Hurricane — adds two side-arrows to every basic attack and another 40% Attack Speed. The side arrows apply Plasma to nearby enemies, so in a teamfight Kai'Sa stacks Plasma on the entire enemy team while AA-ing only one target. This is the item that evolves E: 40% plus 30% plus 40% is 110% bonus Attack Speed, clear of the 100% threshold at any level.
4. Guinsoo's Rageblade — gives AD, AP, and Attack Speed in a single slot. Its 30 AP is the first step toward the 100 AP that evolves W (75% cooldown refund on champion hit + 3 Plasma stacks per cast), but on its own it does not clear the bar. Seething Strike makes every third AA apply on-hit effects twice once it is fully stacked.
5. Infinity Edge — late-game crit multiplier (a critical strike deals 200% damage by default; Infinity Edge's +30% critical strike damage takes every crit to 230%). Combined with Runaan's two extra projectiles, every basic attack rolls 3 crit chances at once.

Situational items:

• Lord Dominik's Regards — vs HP/armor stackers (Cho'Gath, Sion, Malphite, Ornn). Replace Infinity Edge as 5th item if the enemy team has 2+ tanks.
• Mortal Reminder — vs healing-stacking comps (Soraka, Vladimir, Aatrox). Applies Grievous Wounds (a debuff that cuts the target's healing and health regeneration by 40% for 3 seconds).
• Maw of Malmortius — vs heavy AP burst (Syndra, Veigar, Brand support — burst mage = a champion that deletes you in 1-2 seconds with one combo). Magic resist + a damage shield below 30% HP buys the second R needed to escape.
• Bloodthirster — vs heavy poke. Lifesteal heals you mid-fight; when overhealed it stores HP as a temporary shield.
• Phantom Dancer — vs assassins or divers (Zed, Kha'Zix, Talon — champions designed to dive onto the back line). Its Ghost passive lets you walk through enemy minions and champions while kiting (moving back while attacking).

Boots: Berserker's Greaves is the only correct choice. Attack speed feeds the E evolve and the Q multi-missile DPS during R combos.

Skill order: Max Q first (main DPS, biggest evolve payoff). Max E second (more cooldown reduction and longer Attack Speed window). Max W last (utility only — long range + Plasma stacking, but worst base damage per skill point): since patch 26.13 its rank-1 cooldown is 20 seconds and every extra rank shaves only 1.5s, so the points do more work in Q and E. Take R at levels 6, 11, 16.

Runes: Primary tree Domination (the burst-AA tree) with Hail of Blades (3 super-fast attacks the moment you start AA-ing a champion), Taste of Blood (heal 16-40 HP on damaging an enemy champion every 20s), Sixth Sense (automatically tracks a nearby hidden ward every 250s), Ultimate Hunter (6 ability haste on R, plus 5 more for each enemy champion you take down for the first time). Secondary tree Precision with Triumph (heals on takedown — kill or assist) and Coup de Grace (extra damage on enemies below 40% HP).

Key matchups

• Caitlyn: Out-ranges Kai'Sa hard at level 1 (650 AA vs 525). Stay behind your minion line and only step up when she places a trap (she is animation-locked while placing). Power-farm safely (focus only on collecting minion gold without risks) until Kraken Slayer completes; then look for cross-map W picks once you can dash in with R.
• Draven: Loses an AA war straight up — his Q axes deal way more per AA than your basic. Avoid 1-for-1 trades; only commit when his axes hit the ground and he has to walk over to catch them. Save W as a poke-only tool until Kraken Slayer is online.
• Lucian: Loses to Kai'Sa post-6 but bullies her at levels 2-5 with passive double-shot. Dodge his Q through minions, save E as a panic disengage (an ability that breaks an enemy's full-commit trade). Hold lane priority by farming under tower until you are level 6, then look to all-in on his next mistake.
• Vayne: Kai'Sa wins the early lane (Vayne is melee until she hits 3 items). Push the wave (send your minions forward into her tower) every chance you get, harass (deal small chip damage to drain her HP) with W every cooldown. After minute 25 she scales harder, so close the game in mid-game or it tilts toward her.
• Jhin: Long-range poke matchup. His W is a 3000-unit line shot that roots you only if one of his allies damaged you in the last few seconds. Stay behind your front minion line and never trade during his reload window — he is at his strongest with a fresh mag, weakest during the 2.5s after his 4th shot.

Power spikes & win conditions

• Level 6: First R unlocks pick attempts (eliminating a lone enemy outside a teamfight) on chip-killed lane targets. Land W + 2 AAs on the enemy ADC, then dash in with R the moment they walk up to last-hit (auto-attack the killing blow on a minion).
• Kraken Slayer completion (~ minute 12-14): Lane priority flips. You can shove (push the wave fast) with Q, then roam (leave lane to help allies) for cross-map plays on Drake or mid skirmishes (small fights between 2-3 players in the river or jungle).
• E evolve ( Kraken Slayer + Berserker's Greaves + Runaan's Hurricane complete): three attack-speed items stack to 110% bonus Attack Speed and clear the 100% threshold. Two items in you are sitting on 70%, which evolves E only at level 18 when stat growth covers the gap, so the third item is the real moment and the boots are not. Evolved E turns Kai'Sa Invisible for 0.5 seconds the moment you cast it, and that half second is the difference between dashing in with R and dying instantly and dashing in and getting the kill: nobody can click you, so single-target CC has nothing to land on. It is invisibility, not untargetability — an area spell dropped where you stood still hits you.
• Q evolve (~ minute 22-24, after Kraken Slayer + Guinsoo's Rageblade): Q now fires 12 missiles instead of 6 — single-target burst on champions roughly doubles. Force teamfights at every objective.

Common mistakes

• Throwing R at a target with no Plasma on it. R can only be cast on an enemy champion currently affected by Plasma, so with a clean target the button simply will not fire. Always W-then-AAs first, watch the Plasma indicator above the target's HP bar, then commit R.
• R-ing at 100% HP into the enemy team. R is a finisher, not an engage. The shield from R is small (~200 base at rank 3, plus AD/AP scaling) and lasts 2s — you will die instantly if the enemy front line is still up. Wait until at least one of: target below 40% HP, enemy CC on cooldown, or your team already on top of them.
• Over-pushing the wave without vision. Kai'Sa has no built-in escape until E evolves. If you push past mid-river without your support warding tribush (small terrain spots that block vision) and river, the enemy jungler kills you for free.
• Skipping Berserker's Greaves for tankier boots. Plated Steelcaps look tempting against an AD-heavy enemy team, but they delay the 100% Attack Speed threshold that evolves E. No evolve = no invisibility = your R is a death sentence.
• Saving E for offensive engage. E's main value is the brief Ghost (passes through units) + Attack Speed window during a fight. Press E after you R, not before — the 0.5 seconds of Invisibility start the moment you cast it, so spending them from a safe spot wastes them.

Advanced tip

The flash R finisher works the opposite way Kai'Sa is normally played. When an enemy ADC is escaping at low HP into fog of war (the parts of the map you cannot currently see) and your R would dash you out of position, Flash (summoner spell that teleports 400 units in a chosen direction) toward them first to get into R range, then immediately R. Burns Flash but turns a near-escape into a guaranteed kill at high ranks. The trick: queue the R cast 0.1s after Flash by holding the R button — League's input buffer fires R the instant Flash lands, so the enemy never sees the dash coming.