Ossuary Engine

Transform a prepared corpse, pile of bones, or mass grave into a stationary necromantic engine occupying a 10-ft. cube. It preserves corpses within 30 ft. and grants undead you control that start within 30 ft. temporary hit points equal to your WIS modifier. As an action while within 120 ft., lash one creature within 30 ft. of it; the target makes a CON save, taking 33 (6d10) necrotic damage on a failed save, or half on a success. Only one Ossuary Engine can be active.