Priestess

Priestess is a mutated cephalopod (squid/octopus) or jellyfish that guards Thornheart's underground laboratory inside Scarecrow Mansion. It was later encountered by Ryan Taylor and Kate Green rising up from the murky water tank after deactivating the self-destruct system from the control panel. It can traverse on land and through waters, primarily uses its tentacles to attack and cling on obstacles, and creates a sound similar to other aquatic animals.

The two AMS agents fought against the monster eventually shooting a tank filled with an explosive substance and incendiary rounds causing the creature to explode into numerous pieces of flesh and guts.