- Main article: Enemies (Dungeon Siege)
Tretch are a group of tall sentient trees that lives in the steamy swamp. They resembles a dead rotting tree with massive yellow eye and have two flexible branches that can be used as arms. When there are no preys hanging around, Tretch usually sways as if it was pushed by the winds while waiting for an unsuspecting adventurers walking past. When attacking, Tretch will swipe their branches and lashes at their foes. When killed, Tretch will drops its branches to its sides and drooped as if it just withers.