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From Warhammer 40k - Lexicanum
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'''Psychic phenomena''' and more deadly '''perils of the warp''' have a chance of occurring whenever a [[psyker]] uses their [[psychic powers]].{{Fn|4}}
When a psyker uses one of their powers, they invariably draw from the essence of the [[warp]] to manifest fantastic abilities that would be otherwise impossible to perform. However, using psychic powers sometimes yields unexpected and unpleasant results, because the energies of the warp are unpredictable and it is filled with daemons [[daemon]]s who are drawn to psykers. The Empyrean can bleed into reality when a psyker draws into the warp for power; the deeper they draw, the higher the risk of unbidden phenomena occurring.
When a psyker uses their power, they run the risk of incurring psychic phenomena, proportional to the amount of power they choose to wield; more powerful effects are thus riskier. Most psychic phenomena do little harm, but there is a slim chance that they may suffer perils of the warp, a category of phenomena that are very harmful indeed.
