The Larva is a restless ghost born of the forgotten dead. When the living neglect to give a corpse its last rites, especially out of spite or callousness, the deity Charon denies the corpse's spirit entry into the Underworld. Such spirits then return to the lands of the living as beguiling, shapeless devils in order to torment those among the living who offended them.

The Larva can be distinguished from the Lemures in that the Larva always wears a mask. Sometimes, the mask is a warped caricature of who it was in life. Othertimes, the mask is merely a grotesque aid that frightens the living.

The best way to exorcise the Larva is to remember who it was, and apologetically give it its long overdue funerary rituals. Barring that, there is not much that can be done beyond, ironically, ignoring the Larva and pretending it does not exist.