Upon fitting a large foreboding key into the door's lock, you reach the deepest room of the Earth Temple, the inner sanctum. Unexpectedly the door shuts from behind, trapping you inside.

Shortly after you find a group of child-looking ghosts running about the inner sanctum, learning they're called Poes. Surprised of your presence, the Poes all turn towards you with cold stares. Shortly thereafter they all jump and disappear, one by one, into a strange giant mask in the center of the room, having rather large and round cheeks.

The mask then possessively and erratically floats into the air as a pitch-black mass then forms their master's large, wide and plump figure from said mask as it quickly grows and quite literally "glorps" into being, "solidifying" as it's huge hanging belly jiggles, wobbles and sloshes. It floats menacingly with a newly summoned cursed lantern in hand, its empty mask eyes peering into you.

It's gonna be a long night.