The book "Complete Psionic" (2006) introduced three new standard classes as well as several prestige classes for the psionic character. It also includes a variant psion class called the "erudite" which does not specialize in a specific discipline in the way that psions do (putting it on par with wizard and archivist). It also has the ability to learn an unlimited number of powers but can manifest only a limited few each day. "Complete Psionic" also introduced a number of minor rules changes and clarifications.