Changes

| 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.{{citethisCite Marker End}}

| 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]].{{citethisCite Marker End}}

| 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.{{citethisCite Marker End}}

| 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.{{citethisCite Marker End}}