Kayn wields an ancient weapon and fights Rhaast, the darkin within it, for control. Either the Darkin will triumph, or Kayn will master Rhaast and become the Shadow Assassin. Darkin: Heal for a percentage of spell damage dealt to champions. Shadow Assassin: For the first few seconds in combat with enemy champions, deal bonus damage.
1
REAPING SLASH
Kayn dashes, then slashes. Both deal damage.
2
BLADE'S REACH
Kayn damages and slows targets in a line.
3
SHADOW STEP
Kayn can walk through terrain.
Ult
UMBRAL TRESPASS
Kayn hides in an enemy's body, dealing massive damage when he bursts out.
Ability descriptions from the official Wild Rift website.
This page is for League of Legends: Wild Rift (the mobile game), not League of Legends on PC. A Japanese version with guides and matchup notes is available: 日本語版.