Vordred
The Paladin Slayer
Vordred was created by Sally and Noxus from an ancient evil to slaughter paladins. He seeks Artix’s death to claim the power of the Champion of Darkness, and calls Artix a traitor to that realm for defending the living. His skull armor shields him from Light while his shadow restores his body. Sally later rebuilds him with Chaos after his defeat.
Sources
AQW Wiki: Vordred Monster 1 · AQW Wiki: Sally · AQW Wiki: Vordred NPC · Vordred and Artix (game-scene transcript)