Quasit

A quasit is a demonic creature in the Dungeons & Dragons fantasy role-playing game. Their natural shape is that of a tiny horned, winged and tailed humanoid, although they are capable of shape-shifting at will. They are normally found serving as counselors, spies or spellcasters for more powerful demons or chaotic evil spellcasters. They are weak fighters, although they have several useful tricks up their sleeves, such as poisonous claws and the abilities to shapeshift, turn invisible and cause fear. They generally employ these tricks to the full, as they prefer to use hit-and-run tactics whenever possible. Quasits, and Death Quasits, are also found in some roguelike games such as Moria, Angband and ZAngband. In those games they are always invisible and have the power to reduce their enemies' dexterity. They also make appearances in Neverwinter Nights.