The Revenant is an enemy from Final Fantasy IV.
It is the most powerful undead enemy at Mount Ordeals, and is problematic when it appears in packs with other Zombie-type enemies. A one-target Fire spell by Palom should destroy it. It is resistant against Dark Knight Cecil's weapons, so it is best to have him throw healing items such as Potions at the enemy to inflict damage to them.
Revenants are animated corpses or ghosts in Western folklore that are said to return from the dead to terrorize the living. The word "revenant" is French (Fr. revenir, "to return") and means "one who returns".