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From Warhammer 40k - Lexicanum
→Background
Nevertheless, uncommon individuals are birthed every day with Assignment ratings exceeding '''Pi'''. By Imperial Edict, these men and women are to be discovered and brought to the attention of the [[Inquisition]] to protect against harmful psychic events. With the multitude of threats besieging the Imperium, however, it is only truly practical to investigate those suspected of '''Iota''' level talent or greater.{{Fn|1}}
In the rarest of all cases, the twenty-four point scale of the Assignment does not adequately characterize a being of indescribable ability. Such individuals, for all intents and purposes, pass beyond the scale entirely. These subjects are known as belonging to a “plus” scale or a “reversed” scale, since the standard grading's naming convention is reversed.{{Fn|1}} When uncontained, '''plus''' psykers represent an immediate and catastrophic threat to the Imperium. In theory, there is nothing that a trained '''plus''' psyker cannot accomplish through force of will; , from snapping a [[Titan]] in half to summoning a legion of [[Daemons|Greater Daemons]]. A rogue '''plus''' psyker represents a great danger, and the [[Ordo Hereticus]] of the [[Inquisition]] considers them among the greatest threats they can face. Their souls are poetically said to burn akin to supernova supernovae within the Empyrean, a beacon for daemons flocking and vying for the right to possess their unguarded minds.{{Fn|6b}}
Although rarely used, precise terminology for a negative psionic carries a "-Minus" at the end; a psionic of negative class '''Omega''' is thus properly called an '''Omega-Minus''' psyker.{{Fn|7}}
