The Kayn figure faithfully embodies the Darkin-wielder's shadowy presence. He is depicted in a flowing black cloak that clings to a lithe, athletic silhouette, with a hood casting the face into partial darkness yet revealing piercing eyes and a determined, almost predatory focus. Fine sculpted details capture layered fabric, raised seams, and battle-worn armor plates at the shoulders. The signature weapon, a long curved scythe, is held in a dynamic pose with crimson energy tracing along the blade and guard, suggesting the blade's corrupted, living power. Subtle metallic paint highlights edge work, while the base features relics of Runeterra's battlefield scenery, inviting a dramatic display.

Kayn is a restless, ambitious assassin who roams Runeterra in pursuit of power and mastery. Born at the fringes of Noxus, he encounters Rhaast, a Darkin weapon sealed within a sentient blade, and his fate becomes bound to the weapon's ancient thirst. As Kayn travels between cities and battlefields, he must decide which path to embrace: the stealthy Shadow Assassin, who strikes unseen from the night, or the brutal Darkin form that channels raw chaos through Rhaast. His struggle is internal and external, shaping legends about courage, hunger for power, and the price of wielding a living weapon.