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The Darkin Scythe
The Darkin Scythe

Innate: KaynSquare Kayn wields an ancient, sentient weapon, that battles with him for control. Each instance of damage Kayn deals against champions (excluding damage over time) and Damage rating takedowns causes them to drop orbs, red by Melee role melee champions and blue by Ranged role ranged champions, that are automatically collected upon leaving combat, filling their respective bars.

Based on the first filled bar, Kayn can either return to the summoning platform to interact with his portrait to either be overwhelmed by RhaastSquare Rhaast or expel him to become the Shadow AssassinSquare Shadow Assassin, or wait 4 minutes until the other form becomes available. The transformation will permanently change his abilities and grant him Homeguard.

The Darkin Scythe A

Shadow AssassinSquare Shadow Assassin: Kayn deals 12% − 44% (based on level) of post-mitigation damage dealt against enemy champions as bonus magic damage, lasting for 3 seconds upon entering in combat with an enemy champion, refreshing after 8 seconds out-of-combat with them or by using Umbral Trespass Umbral Trespass.

The Darkin Scythe R

RhaastSquare Rhaast: Rhaast heals for 34.5% − 43% (based on level) of the post-mitigation Attack damage physical damage that he deals with abilities against enemy champions.

Ability Details
  • Each bar gets filled up completely at 400 points.
    • Melee orbs grant 2 points per hit and 6 points per takedown.
    • Ranged orbs grant 3 points per hit and 7 points per takedown.
    • Each bar has a bucket system.
      • The bucket starts at 60 points.
      • Each time an orb is taken the system checks if there's an amount of points in the bucket equal or higher than the amount received from the orb.
        If there is, Kayn is given an additional orb of the same type he received, while also subtracting that amount of points from the bucket.
      • The bucket fills by 0.8 points per second if out of champion combat for 70 seconds.
    • The amount of points received per orb is then multiplied by 3 / 6 / 10 (based on minutes).
  • The orbs will be collected even if Kayn dies.
  • The progress meter above the champion's portrait tracks the highest number of orbs collected between Red and Blue, not the total.
    • The progress bar gives no indication of which transformation is currently leading, which can be difficult to estimate due to the increasing value of orbs over time.
  • If the bars fully fill at the same, only the bar with the highest excess of points will be considered for the transformation.

Reaping Slash
COST: 50 Mana
COOLDOWN: 7 / 6.5 / 6 / 5.5 / 5
Reaping Slash

Active: Kayn Dash dashes forward, dealing physical damage to all enemies he passes through before flourishing his scythe, dealing the same damage again to surrounding enemies.

Physical Damage:
60 / 80 / 100 / 120 / 140 (+ 65% bonus AD)
Total Non-Monster Damage:
120 / 160 / 200 / 240 / 280 (+ 130% bonus AD)

Both instances of Reaping Slash deals 55 bonus damage against monsters.

Reaping Slash R

RhaastSquare Rhaast: Both instances of Reaping Slash's damage are modified to 50% AD (+ 5% (+ 4% per 100 bonus AD) of target's maximum health) physical damage, capped against monsters.

Max. Monster Damage:
200 / 250 / 300 / 350 / 400

The dash's speed scales with Kayn's total movement speed.

Ability Details
  • Spell Shield Spell shields will block only a single instance of damage - either the dash or the slash.
  • As Shadow AssassinSquare Shadow Assassin, an alternate icon for Reaping Slash A Reaping Slash is used but has no modified effect.
  • Other abilities can be queued while casting Reaping Slash.
  • Reaping Slash Reaping Slash may cancel and go on cooldown if cast after Kayn basic attacked an unit during Shadow Step Shadow Step.

Blade's Reach
COST: 60 / 65 / 70 / 75 / 80 Mana
COOLDOWN: 13 / 12 / 11 / 10 / 9
Blade's Reach

Active: After a short delay in which he can't perform any other actions, Kayn performs an upwards sweep with his scythe, dealing physical damage to all enemies in a line and Slow icon slowing them by 60% decaying over 1.5 seconds.

Physical Damage:
90 / 135 / 180 / 225 / 270 (+ 130% bonus AD)
Blade's Reach A

Shadow AssassinSquare Shadow Assassin: Blade's Reach's range is increased by 200. Additionally, Kayn conjures a living shadow at the casting position to perform Blade's Reach in his stead, allowing Kayn to perform other actions.

Blade's Reach R

RhaastSquare Rhaast: Blade's Reach Airborne icon knocks up enemies for 1 second.

Ability Details
  • No additional details.

Shadow Step
COST: 90 Mana
COOLDOWN: 21 / 19 / 17 / 15 / 13
Shadow Step

Active: Kayn gains 40% bonus movement speed, is Ghost ghosted and can ignore terrain collision for 1.5 seconds. Immobilizing effects will interrupt Shadow Step.

Kayn heals himself upon moving through terrain for the first time and, if he's not in combat with enemy champions, Shadow Step's duration is increased. While inside terrain, Kayn's vision pierces all obstructions although cannot see into brush.

100 / 115 / 130 / 145 / 160 (+ 40% bonus AD)

Empowered Duration:
7 / 7.5 / 8 / 8.5 / 9

Entering combat with a champion after the effect is enhanced reduces the remaining duration to 1.5 seconds. The effect also cannot remain active out of terrain for longer than 1.5 seconds.

Shadow Step A

Shadow AssassinSquare Shadow Assassin: Casting Shadow Step removes Slow icon slows and makes Kayn immune to them for the duration. Additionally, entering terrain will increase the bonus movement speed to 80% for the remaining duration.

Ability Details
  • As RhaastSquare Rhaast, an alternate icon for Shadow Step R Shadow Step is used but has no modified effect.
  • Unblocked vision allows Kayn to see the full circle of his vision radius, with the exception of within brush. Note that despite not being able to see into brush, he can still see things beyond the brush.
  • Effects such as VayneSquare Vayne's Condemn Condemn and PoppySquare Poppy's Heroic Charge Heroic Charge apply an immobilizing effect and so interrupt Shadow Step, meaning as Kayn's opponent you do not have to worry about pushing him to safety.
  • Enemies cannot see KaynSquare Kayn while he is inside of terrain unless they have terrain-piercing vision, such as Heightened Senses Heightened Senses, Hawkshot Hawkshot or Comet of Legend Comet of Legend.
    • However, enemies will be notified if nearby terrain is infested if Kayn is within 1000 units - with an indicator being placed on the terrain with a direct line between Kayn and the enemy champion. Slightly less than standard sight radius, but more than the Ambush 2 Camouflage detection radius.
  • While moving in terrain, Kayn is considered dashing, so Knockdown icon knockdown effects would stop him from moving.
  • Kayncan move up to 550 units beyond the outer-edge of the battlefield.
  • While in terrain, Kayn will not be considered unseen for the sake of Duskblade of Draktharr item Duskblade of Draktharr.

Umbral Trespass
COST: 100 Mana
COOLDOWN: 120 / 100 / 80
Umbral Trespass

Passive: Whenever Kayn damages an enemy champion, he applies Umbral Trespass for 3.5 seconds.

Active: Kayn Dash infests a marked enemy champion for up to 2.5 seconds, True Sight icon revealing them and becoming Playful untargetable for the duration. Reactivating Umbral Trespass ends it earlier.

Umbral Trespass 2

Upon reactivation or at the end of the duration, Kayn wrenches himself Dash free from their body 350 range away in the cursor's direction, dealing physical damage to the target.

Physical Damage:
150 / 250 / 350 (+ 175% bonus AD)

Shadow AssassinSquare Shadow Assassin: Umbral Trespass gains 200 bonus range and emerging from the target resets The Darkin Scythe A The Darkin Scythe's cooldown.

Umbral Trespass 2 R

RhaastSquare Rhaast: Umbral Trespass is modified to deal 10% (+ 13% per 100 bonus AD) of target's maximum health physical damage, and heals him for「 7% (+ 9.1% per 100 bonus AD) of target's maximum health 」「 70% of the pre-mitigation damage 」.

Ability Details
  • As RhaastSquare Rhaast, an alternate icon is used for the initial activation of Umbral Trespass R Umbral Trespass.
  • Spell shields will prevent Kayn from infesting the target, but will do nothing to mitigate the damage once he has already infested them. This is consistent with other delayed-detonation abilities, with the exception of Time Bomb Time Bomb, which was special-cased in V4.13 to behave differently.
    • If Kayn targets an enemy with a spell shield, the ability will go on cooldown and nothing will happen. Kayn will not dash on the target and then fail, he will simply do nothing.
    • While often compared to a spell shield, FioraSquare Fiora's Riposte Riposte has been special-cased to instead prevent Kayn from targeting her with Umbral Trespass Umbral Trespass. If he has already infested her, it will still block the damage as it grants her invulnerability.
    • The damage is not blocked by untargetability.
  • While inside an enemy champion, Kayn will be considered unseen for the sake of Duskblade of Draktharr item Duskblade of Draktharr.