the Shadow Reaper
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The Darkin Scythe (Passive)

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.

Reaping Slash (Q)

Cooldown: 7/6.5/6/5.5/5

Cost: 50

Range: 350

Kayn dashes forward to strike nearby enemies. Both dash and strike deal 75/95/115/135/155 (+0.65) physical damage.Darkin: Deal a percentage of the target's maximum health instead.Deals 40 bonus physical damage to minions and monsters.

Blade's Reach (W)

Cooldown: 13/12/11/10/9

Cost: 60/65/70/75/80

Range: 700

Kayn deals 90/135/180/225/270 (+1.3) physical damage and slows enemies hit by 90%, decaying over the next 1.5 seconds.Shadow Assassin: Gain extra range and the ability to move during Blade's Reach.Darkin: Gain a knock up.

Shadow Step (E)

Cooldown: 21/19/17/15/13

Cost: 90

Range: 400

Kayn gains 40% movement speed and the ability to walk through terrain for 7/7.5/8/8.5/9 seconds. When he first enters terrain, he is healed for 100/115/130/145/160 (+0.4).Shadow Assassin: Cooldown is set to n seconds, gain more movement speed, and slow immunity.Maximum duration in combat with enemy champions: 1.5 seconds.Immobilizing effects and spending more than 1.5 consecutive seconds outside of terrain end Shadow Step immediately.

Umbral Trespass (R)

Cooldown: 120/100/80

Cost: 100

Range: 550

Kayn infests an enemy champion he has recently damaged, becoming untargetable for up to n seconds. Reactivate to end this effect early. When Umbral Trespass ends, the target takes physical damage. Shadow Assassin: Gains extra range (both when entering and exiting Kayn's victim) and refreshes The Darkin Scythe on exit.Darkin: Deals percent maximum health damage and heals for a percentage of target maximum health.