Passive: Kayn gathers orbs from his targets. These orbs are of two different kinds and will appear upon damaging an enemy champion. If he attacks ranged champions, he will get blue orbs, while if he attacks melee champions, he will gain red orbs. These orbs will fill up a bar which will allow him to choose between two forms, one of which, when chose, will be his permanent form the entire game. The forms and their bonuses are as follows:
Shadow Assassin: On being out of champion combat for over 8 seconds, he will deal bonus magic damage to the enemy champion on the first instance of his damage dealt. This is also applicable to his Ultimate.
Darkin: Heals for the post-mitigation damage he deals with abilities against enemy champions.