A Gloom Prism is a Necron artefact that can be carried by Canoptek Spyders, Canoptek Tomb Stalkers and Canoptek Tomb Sentinels. A Gloom Prism takes the form of a green crystal laced with arcane circuitry that can generate an anti-psychic null field. This in turn creates a zone approximately fifty metres in diameter that is shrouded from all Warp-spawned powers. The Gloom Prism produces this effect by severing the connection that daemons and psykers have to the Immaterium through an unknown arcane technology.
- Black Crusade: The Tome of Fate (RPG), pg. 111
- Codex: Necrons (5th Edition), pg. 46
- Codex: Necrons (7th Edition) (Digital Edition), pg. 208
- Deathwatch: The Outer Reach (RPG), pp. 132-133
- Imperial Armour - Volume Twelve - The Fall of Orpheus, pg. 116, 121