Nazgorean, Eelbat

An Eelbat looks like an eyeless eel with bat-like wings and gray slimy skin. Despite the lack of visual organs, it can sense its surroundings like a bat and it effectively has Darkvision out to 60 feet. It attacks by biting, and after a successful bite it will hang on and drain an additional 1d6 points of damage every round. An eelbat can only be removed by killing it; any attack on the creature while attached receives an attack bonus of +2, but any attack that misses will hit its victim instead.