The Revenant Champion is a Revenant Horror / Zombie Slayer 5Mini-Boss that has a small chance to be spawned when a player with an active Revenant Horror Tier IV Quest kills a Zombie.
Mini-Boss
IV
The chances of spawning one can be increased by the Combat XP multiplier, which can be increased by the Slayer combat multiplier, Viking's Tear potions, and/or a LEGENDARY Wolf Pet. Winter event potions do not count toward slayer Combat XP.
Combat XP multiplier, which can be increased by the Slayer combat multiplier, Viking's Tear potions, and/or a LEGENDARY Wolf Pet. Winter event potions do not count toward slayer 
Revenant Flesh
Coins
Experience Orbs
Added Revenant Champion.