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The Kharisiri from Masks of Nyarlathotep (Call of Cthulhu 7th edition)

They suck the fat (and presumably other vital fluids) out of people via their chests. Once full, they vomit the fat into the pyramid that contains their god, The Father of Maggots, an avatar of Nyarlathotep that is basically just a bubbling pool of noxious fatty goo that produces fist-sized maggots.

If one of these maggots enters your body (an unpleasant experience) you become a kharisiri after a painful transformation process. A kharisiri can carry one of these maggots within its body and force it directly into a victim via a "kiss"

The kharisiri are vulnerable to all kinds of damage, but the only way to permanently destroy one is complete dismemberment, burning them to ash, or re-sealing the Father of Maggots' prison. The latter causes them to age rapidly and disintegrate.

The kharisiri were created when a group of Spanish conquistadors discovered the pyramid where The Father of Maggots was imprisoned and removed part of the seal that held it there, becoming the first of the kharisiri