Princes of the Apocalypse
Priest of the Black Earth
Larrakh is a priest of the Cult of the Black Earth. His physical features are not visible, as he wears a face-covering mask.
He was working in a cavern underneath Red Larch, and was either working with the Believers, or corrupting them. It’s also possible he’s encountered the Delegation. He was confronted by the party, but escaped before they dispatched him.