Terrifying flying monstrous creature that is vulnerable to light.
The Umbra are an alien species appearing as smooth black spheres that live in the void of space, often observed attracted to areas resonant of the warp such as starship hulls and warp engines or suspected entrances to the Aeldari Webway. They can manipulate and control shadows to form terrifying limbs of hooks, blades, teeth and other nightmarish shapes.