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Beings which utilize psychic powers, or [[psykers]], exist within many of the races residing within the galaxy. Human psykers, [[Eldareldar]] [[Warlockqarlock]]s and [[Orkork]] [[Weirdboyzweirdboyz]] all fall into this category.{{Fn|2}} Beings such as [[Daemonsdaemons]] of the Warp warp are made of purely psychic energies.{{Fn|3}} There are racesspecies, like the [[Tautau]], which are devoid of psykers or psychic powers.{{Fn|4}} There are even beings which could be called anti-psykers, Human human [[Blanks|Untouchablesblanks]]{{Fn|1}} and [[Necron Pariah|necron pariah]]s.{{Fn|5}} Due to their use in the armies of Man and their relative abundance in the Imperium's enemies, the Imperium has devised a way to classify all psykers it may come across.{{Fn|1}}The average ''Homo Sapiens Imperial'' is judged to have an Assignment assignment rating of '''Rho''' or '''Pi'''. These individuals cannot consciously or subconsciously draw power from the [[Immaterium]] and are not able to become possessed without outside psychic influence. As the vast majority of Mankind mankind falls into this Assignment assignment level, the common Imperial imperial citizen poses little psychic security threat.{{Fn|1}}

Nevertheless, uncommon individuals are birthed every day with Assignment assignment ratings exceeding '''Pi'''. By Imperial Edictimperial 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 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 supernovae within the Empyrean, a beacon for daemons flocking and vying for the right to possess their unguarded minds.{{Fn|6b}}

The grading of an individual can change over time.{{Fn|11}}{{Fn|13}} It is not uncommon for a psyker to unlock greater levels of power as they continue to practice, grow , and mature.{{Fn|11}}{{Fn|12a}}{{Fn|13}} For example, a '''delta''' level psyker might become a '''gamma''' or even '''beta''' over their career as a [[Sanctioned Psyker]].{{Fn|12a}} Psykers might grow beyond their initial grading. This warrants subsequent reclassification to more accurately reflect their burgeoning powers.{{Fn|11}}{{Fn|12a}} Because the assignment is based on things like strength (e.g. how much mass a telekinetic can move) and ease of use (how much effort the psyker has to put in to making their powers work) and so on, a psyker can perform above their assigned grade with the application of other external factors, such as enhancing implants ([[Mortanna Shroud]] has these) or performance enhancing drugs, such as [[spook]] or [[ghast]].