Kayn

Abilities Overview

Kayn's passive, Darkin Scythe, allows him to transform into one of two forms based on which type of champion he damaged most. Rhaast heals from all damage dealt and excels in extended fights. Shadow Assassin deals bonus magic damage on initial attacks after entering champion combat. The transformation choice defines Kayn's entire playstyle for the game.

Q (Reaping Slash) dashes and deals damage in an AoE — excellent for clearing camps and teamfights. W (Blade's Reach) is a line skill shot that slows — as Rhaast it knocks up, as Assassin it leaves a shadow clone. E (Shadow Step) allows Kayn to walk through walls, healing a percentage of damage taken from champions. R (Umbral Trespass) enters a champion's body, becoming untargetable and dealing damage based on their max HP.

Form Choice and Pathing

Pre-6 full clear is Kayn's standard — aim for 3:15 clear time. Transform as early as possible (typically 8-10 minutes). Against melee-heavy comps, focus Rhaast for the tankiness and healing. Against 3+ ranged targets, Shadow Assassin for the burst potential. Kayn's E through walls makes his gank paths unpredictable and very hard to ward against.

Early game, focus on power-farming and counter-ganking rather than aggressive ganks. Post-6, look for R ganks to dive turrets safely — R makes you untargetable, dropping turret aggro. Kayn's objective control is strong — use E to quickly rotate between dragon/baron and lanes.

Teamfighting

Rhaast teamfights as a front-line diver. Use W knockup to disrupt, Q for AoE damage, and R to dodge critical abilities and heal. Rhaast's healing from passive makes him incredibly durable in extended fights. Save R for when you're low to maximize healing.

Shadow Assassin teamfights as a cleanup assassin. Flank from wall with E, Q-aa-W onto the backline, and R the priority target to finish them and escape. Shadow Assassin is weaker in extended fights — get in, kill, and get out using wall mobility.

Build Path

Start Hailblade with Refillable. Rhaast build: Goredrinker or Eclipse for sustain, Black Cleaver for armor shred, Sterak's Gage for survivability, Death's Dance for damage delay. Shadow Assassin build: Duskblade or Youmuu's for lethality, The Collector for execute, Edge of Night for spell shield.

Boots are Plated Steelcaps or Mercury Treads. Lord Dominik's Regards for armor pen. Guardian Angel for insurance. Maw of Malmortius against heavy AP.

Matchups

Kayn is flexible depending on form choice. He struggles against early-game aggressive junglers (Lee Sin, Graves, Xin Zhao) who can invade him before transformation. Against these, concede early objectives and focus on reaching form transformation. Kayn scales well into mid and late game regardless of form.

For more details, check the League of Legends Wikipedia page and the Kayn page on League of Legends Wiki.