| rowspan=2 | Very high level of mental psychic activity.{{Fn|1}} Most Imperial worlds rarely produce more than a few nascent psykers every decade, let alone more than a couple with the raw potential to reach epsilon or zeta levels of power with proper training.{{Fn|23}}. 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}}