Mlok is a creature, possibly a Great Old One who landed on Earth in ancient times somewhere near the Bnazic desert (EXP: "The Priest of Mlok" [Gary Myers]) known to devour human victims for sustenance.
A bloody cult was created around Mlok and it became strong in the city of Drinen. (EXP: "The Gods of Drinen", "The Tomb of Neb" [Gary Myers])