A power class is a relative level of effective metapsychic power which general falls into four levels: Normal, Master, Grandmaster, or Paramount.
Although practitioners in the same power class may be roughly equal in raw ability, nuances and subtleties of the precision and program integration skill can change the classification. THe specifics of how these power classes are measured was never put into detail.
Normal
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Master
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Grandmaster
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Paramount
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Sometimes called "Paramount grandmaster".