Pishtaco
A pishtaco (in Northern Quechua "slaughterer, cutthroat"), ñaqaq (in Southern Quechua, similar meaning) or kharisiri (in Aymara,"slaughterer") is a folkloric boogeyman figure in the Andes region of South America, particularly in Peru and Bolivia, which extracts the fat of its victims.
It is believed to have originated in Spanish conquistadors' practice of using Indigenous Peruvians' corpse fat as treatment for wounds and illnesses.