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From Warhammer 40k - Lexicanum
→Effects on the Host
Daemonic possession eventually takes its toll on the mortal body until it is consumed and destroyed by the power. Initially, they may remain human in appearance, but over time the human form will be corrupted - its eyes will start to change, sometimes becoming blood red, or taking on the look of a cat's or snake's eyes, while the bone structure will be reformed, resulting in horns and other inhuman features.{{Fn|1}}
The host also usually manifests [[psychic powers]] as a result of their close connection with a creature of the warp, sometimes so powerful that the host's body can barely contain it. They may appear to arc with electrical energy, cause minor air disturbances and often float a few inches from the ground. Daemonhosts also benefit from the invulnerability's of the daemon inhabiting its body, though the particulars may change from daemon to daemon. Some may only be harmed with silver, while others may be destroyed by sunlight. Some need to consume nothing but blood to survive. These traits may account for the stories of Vampyre cults that exist on some worlds in the [[Imperium]].{{Fn|3}}
Eventually, no matter how powerful a host's will, the experience of sharing a mind and body with a daemon will lead to insanity, effectively bringing an end to the life of the host, and allowing the warp entity to take complete control. In such cases, an exorcism may be of little benefit to the pathetic creature, and death will be the only mercy.{{Fn|3}}