Corrupted Maulers are bears corrupted by foul magic.
Lore
Bears infected by the creeping corruption of the Dark Wood senselessly maul anything within their territory: animals, people, and the land itself. No matter how much blood they consume, only the Countess is sated.[1]
In-game
Corrupted Maulers are a type of monster encountered in Diablo Immortal. It is encountered in the Derelict Timberyard in the Dark Wood.