Psyk-Out Grenade

Psyk-Out Grenades are a very rare specialist form of grenades, used by Grey Knights Astartes, high-ranking Inquisitors and assassins of the Culexus Temple as potent anti-psyker (and by extention anti-daemon) weapon.

Usage
Outwardly, a Psyk-Out Grenade looks much like one of the frag grenades in use by the many forces of the Imperium. Its rarity stems from the special addictive that is laced within its explosive charge. Adeptus Custodes reverently gather the dust that forms from the body of the Emperor of Man entombed in the Golden Throne. This byproduct of the Golden Throne's workings has the unexplained property to possess a strong anti-psychic charge, similar to a being afflicted with the Pariah gene.

The advantages of the substance has not escaped the Holy Ordos of the Imperial Inquisition, and the gathered dust is almost exclusively used for the construction of Psyk-Out grenades. (Although small amounts of the substance are sometimes bequeathed as holy relics to mighty Cardinals of the Ecclesiarchy.)

When a Psyk-Out grenade detonates, the sacred dust is spread over the whole of the blast radius. Any psyker caught into it will find his (or her) link to the Warp violently severed, and any psychic power active in the radius will be terminated due to being severed from its power source. This traumatic experience will prevent psykers to use any of their powers for a certain time (depending on the psyker's might) and interrupt any active power, with potential fatal consequences for the user. The severing of the connection to the Warp is also a potent tool against daemons: minor daemons will be banished outright, unable to maintain their physical form, and even mijghty major daemons will find themselves severly weakened.

Most Psyk-Out Grenades are used offensively, thrown at the intended target by a Grey Knight, Inquisitor or Assassin to soften it up before moving in forr the kill. but they can also be used defensively, to protect oneself from hostile powers, as was shown by Epistolary Melmoch of the Excoriators Chapter: He sprinkled himself with the sacred dust contained in one of Certus-minor's holy relics, putting him out cold, but protecting him from the psychic feedback of the Khornate Cholercaust crusade who would otherwise have slain him outright.