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From Warhammer 40k - Lexicanum
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Imperial Fists, Word Bearers: ==List of psionic levels==
typos, moving uncited addition to discussion
==Overview==
Beings which utilize psychic powers, or [[psykers]], exist within many of the races residing within the galaxy. Human psykers, [[eldar]] [[qarlockwarlock]]s and [[ork]] [[weirdboyz]] all fall into this category.{{Fn|2}} Beings such as [[daemons]] of the warp are made of purely psychic energies.{{Fn|3}} There are species, like the [[tau]], which are devoid of psykers or psychic powers.{{Fn|4}} There are even beings which could be called anti-psykers, human [[blanks]]{{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 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 falls into this assignment level, the common imperial citizen poses little psychic security threat.{{Fn|1}}
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}}
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}} 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]].
The below lists denotes the points of the Assignment, with their provided description.{{Fn|1}}
''Numbers in brackets are not associated with the approved terminology, and exist exists within the table to illustrate a cardinal order of the terms, with 0 denoting the first psionically inert level, negative numbers indicating negative psionic levels, and numbers with plus indicating plus scale levels.''{| cellpadding="5" cellspacing="1" border="1" width="100%" style="background:transparent;border-collapse:collapse;margin:auto;"
|- style="color:#dddddd;background-color: #555555;"
! colspan="2" width="20%" style="text-align:center;"| Ordinals
! Description
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Omega (Ω)| style="font-size:80%;text-align:center;" | *(-7)
| Usually referred to as Untouchables, blanks, or pariahs. These individuals are so inert in the Warp as to actually exhibit negative psychic influence upon others.{{Fn|1}} Primarily manifested as a small region of “blankness” surrounding the individual, it is impossible for psychic powers or warp creatures to penetrate this space.{{Fn|8}} Imperial science has shown the dead area surrounding the subject interferes with natural electrical-mental functions. This often results in irrational fear and loathing for the individual from baseline humans.{{Fn|9}} For [[psykers]], however, they are physically and mentally painful to be near.{{Fn|8}} This is the grade of [[Sisters of Silence]], [[Culexus Assassin]]s, and [[Solitaire]]s.
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Psi (Ψ)*Chi (&<br>Chi;)*Phi (&<br>Phi;)*<br>Upsilon (Υ)*Tau (&<br>Tau;)*Sigma (&<br>Sigma;)| style="font-size:80%;text-align:center;" | *(-6*)<br>(-5*)<br>(-4*)<br>(-3*)<br>(-2*)<br>(-1)
| Psionically-dense individuals who are oblivious to warp fluctuations and psychic probing. The range of this ability varies, with the highest class being just deemed 'blunt' to some psionic effects, the lowest class being extremely resistant to effects of psychic activity, yet still considered ''touchable '' by a measurable extreme degree of psionic power.{{Fn|1}} These grades generally qualify someone to be a crew member of a [[League of Black Ships|Black Ship]].
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Rho (Ρ)| style="font-size:80%;text-align:center;" | *(0)
| No manifestation of psychic talent (common human being).{{Fn|1}}
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Pi (Π)| style="font-size:80%;text-align:center;" | *(1)
| Second of the two so-called inert psychic levels.{{Fn|1}} Possesses, however, some degree of psionic power. The manifestations are so insignificant that if they happen to be noticed they are quickly denounced as "good luck" or a pretension to a sixth sense.{{Fn|7}}
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Omicron (Ο)*Xi (&<br>Xi;)*Nu (&<br>Nu;)*<br>Mu (Μ)*Lambda (&<br>Lambda;)*Kappa (&<br>Kappa;)| style="font-size:80%;text-align:center;" | *(2*)<br>(3*)<br>(4*)<br>(5*)<br>(6*)<br>(7)
| Unconscious and minor level of psionic brain activity, of which the individuals and their surroundings are often unaware unless put to examination. Although these classes are technically by law under the jurisdiction of the [[Inquisition]], it is logistically unfeasible to examine every suspicion of them in the wider galaxy.{{Fn|1}} An example psyker of this grade is [[Mortanna Shroud]], who is a Lambda.
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Iota (Ι)*<br>Theta (Θ)*<br>Eta (Η)| style="font-size:80%;text-align:center;" | *(8*)<br>(9*)<br>(10)
| As the individual is able to control abilities with effort, subjects of '''Iota''' level and higher are true [[psykers]] and upon discovery are usually immediately put under the care of the [[Inquisition]]{{Fn|1}} and the [[League of Black Ships]]{{Fn|6a}}, unless they have a legal excuse not to be, such as having already been recruited into a [[Space Marine]] chapter.
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Zeta (Ζ)*Epsilon (&<br>Epsilon;)| style="font-size:80%;text-align:center;" | *(11*)<br>(12)
| Very high level of mental psychic activity.{{Fn|1}} An example psyker of this grade is [[Calumny Faal]], who is a Zeta. But their powers are growing through practice, prompting the need for reclassification.{{Fn|11}}
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Delta (Δ)*Gamma (&<br>Gamma;)*Beta (&<br>Beta;)*Alpha (&<br>Alpha;)| style="font-size:80%;text-align:center;" | *(13*)<br>(14*)<br>(15*)<br>(16)
| Occurring in approximately one-per-billion human births.{{Fn|1}} Example psykers of this grade include [[Gregor Eisenhorn]] and [[Gideon Ravenor]], both of whom were high Delta or low Gamma (and not necessarily the same grade as each other). [[Agun Soric]] was Beta grade, and [[Esarhaddon]] was an Alpha.
|-
! style="font-size:110%;text-align:center;" |*Alpha Plus (Α+)| style="font-size:80%;text-align:center;" | *(17+)
| First of and numerically almost synonymous with "plus" scale, still occurring the rarest in relation to all previous cases. Their state of mind always comes with a perceivable level of dementation or insanity.{{Fn|1}} Examples of this grade include the unsanctioned psykers known as the [[Apex Twins]], as well as the [[Burning Princess]].
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Beta Plus (Β+)| style="font-size:80%;text-align:center;" | *(18+)
| Assumed to be the highest a human brain can withstand and be in possession of a fading semblance of sanity.{{Fn|1}}
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Gamma Plus (Γ+)| style="font-size:80%;text-align:center;" | *(19+)
| The highest registered psionic human level to date. It is more widely achievable by some unspecified alien species and daemons, but not even they are known to exceed this rank.{{Fn|1}}
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Delta Plus (Δ+)*<br>Epsilon Plus (Ε+)| style="font-size:80%;text-align:center;" | *(20*+)<br>(21+)
| Never measured classifications, remaining only theoretical.{{Fn|1}}
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Zeta Plus (Ζ+)| style="font-size:80%;text-align:center;" | *(22+)
| Considered the highest living tissue can sustain.{{Fn|1}}
|-
! scopestyle=row "font-size:110%;text-align:center;" | *Eta Plus (Η+)*…*<br>∙<br>∙<br>∙<br>Omega Plus (Ω+)| style="font-size:80%;text-align:center;" | *(23*…*+)<br>∙<br>∙<br>∙<br>(40+)
| Levels considered requiring a being's mind to rely on non-corporeal structures for the being to survive.{{Fn|1}}
|}