Introduced to the Cthulhu Mythos by August Derleth in his short story Dweller in the Darkness, Cthuga is a fire being and the only thing feared by Nyarlathotep, the Blind, Faceless One.
Cthuga is invoked by gazing toward Fomalhaut and repeating these words three times: Ph'nglui mglw'nafh Cthuga Fomalhaut n'gha'ghaa naf'l thagn. Iä! Cthuga!