Owlbear

The Owlbear is a huge monstrous beast with the body ofa bear covered with thick fur and feathers with the head of an owl.

Encounters
The Owlbear can be found on all floors of the dungeon. It can be a Wandering Monster. If you say the command "listen" before entering a room with an owlbear, you will hear "a mean roar and hooting."

Strategy
The Owlbear is a medium-advanced creature, meaning it is somewhat difficult to kill. It has no special powers other than the ability to cause a significant amount of damage(more than a lich).