The Doom appears to be a one-off creation of the Hive Mind, produced with great difficulty. It is a unique vampiric Zoanthrope, that feeds upon psychic energy. Over its skull sits a long, spine-like growth like a hood and vestigial claws emerge like ribs from its side. Psychic energy can be visibly seen crackling along these structures. In combat, it uses them to focus its psychic powers and draw all the life-energy from its surroundings. A similar creature is thought to have singlehandedly destroyed the Aeldari Craftworld of Malan'tai by devouring the spirits from its Infinity Circuits.