"Though it may appear to be made of normal matter when it materializes in realspace, a Daemon’s form is no more physical than it is in the Realm of Chaos. Outside of the immaterium, Daemons have particular invulnerabilities and weaknesses, as well as many destructive and terrifying powers derived from their warp-born nature. Slaying a Daemon’s physical projection only severs its presence in reality, banishing it back into the warp. While its true essence remains unharmed, the blow to the Daemon’s pride is considerable, and those that are forcibly returned to their own realm must endure the mockery and torment of their fellows until they can return to corporeal form and avenge themselves – assuming they are not simply re-absorbed by their creator as the price of their failure."

- Codex: Chaos Daemons (8th ed.), pg.7