What is PRC? Thanks. Player Resource Consortium. Adds a bunch of bew spells, classes, feats, skills, races, and uses a different epic spell casting system. Also a psionics system coming in the new update, IIRC.

PRC home page.
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Captain's Log, Stardate 6051: had trouble sleeping last night... my hiatal hernia is acting up. The ship is... drafty and damp; I complain but... nobody listens.