Everything

The fomarch Icomammus is a horse-sized, wraith-like being that seems to hover over the ground. Unlike other fomarchs, extreme physical violence isn’t its strength. The threat of Icomammus comes from within. The monster’s body is a semi-translucent shell of deceptive hardness, with the general shape and bioluminescent appearance of a jellyfish, down to the hundreds of whip like stingers that dangle from its body. But the bell-like horror isn’t just an empty cartilaginous ball of mesoglea. As the ghostly fomarch drifts in the wind, the cloudy liquids floating within its body clear, and a gray, human-sized fetus sus-pended within, lacking a nose or mouth. Its enormous jet-black eyes sometimes cut through the liquor amnii to peer out. Those who catch its gaze can feel Icomammus rifling through their thoughts and memories.

In addition to this telepathic probe, Icomammus supports itself by psychic projection, though its teleki-netic gifts do not extend beyond self-propulsion. The rest of its vast psychic powers depend entirely on the delivery of a toxic sting from one of its many tentacles.

After injecting a target with the psychoactive venom of Icomammus, the fiend may project illusions intense enough that they become like reality, to the point of doing extreme psychosomatic damage to victims.