Ebon Geist is one of the warp entities.
Ebon Geists or Warp Predators are a nearly-mindless creatures that hungers for life of mortals. Ebon Geist is blacker than an emptiness itself. It writhing like a shadow, supple and elusive but its talons sharp and deadly. The attacking Ebon Geist leaves behind only an empty husks and the screaming shadows of its victims.