Attacks made behind the enemy have a 100% chance to strike critically with a base damage of 125%, and an additional 0.5% for every 1% critical rate Quillen gains. None of the attacks made in front of the enemy will be critical strikes. The highest amount of damage dealt to non-heroes is capped at 2,000.

Quillen attacks twice in the target direction, dealing 150 (+65% of bonus AD) physical damage each time.

Quillen moves in the target direction rapidly and attacks a nearby enemy after reaching his destination, dealing 325 (+80% of bonus AD) physical damage and marking the target for 10 seconds. Each time Quillen attacks the marked target, the target's movement speed is reduced by 30% for 1 second and the cooldown for Decimate is reduced by 1 second. Quillen also takes 30% less damage from the marked target. Only one enemy can be marked at any given time.

Quillen becomes invisible after 0.2s. While invisible, he restores 180 (+30% of bonus AD) HP every 0.5s and increases his movement speed by 40% for 3s. Attacking removes invisibility, and increases Quillen's attack damage by 120 for 3s. Quillen's movement speed will also be increased by 30% for 1s whenever he deals damage to enemies.

Getting kills or assists refreshes the cooldown of all skills.