All magic is believed to come from the true source, the male half of which has been corrupted, causing male spellcasters to go insane as the insanity spell within D4 years of first learning to cast. There are multiple exceptions to this rule.
- Rangers, paladins, hexblades, and other male half casters are generally unaffected. Rangers and paladins receive their caster ability through an intermediary, which shields them from the taint.
- Blade magic and psionics, as separate power sources, do not cause insanity.
- Invocation based casting, such as by the warlock or dragonfire adept, are counted as powers granted through an intermediary and are not subject to insanity.
- The sorcerer, wizard, beguiler, cleric, druid, favored soul, bard, and all other full caster classes are not available, and are replaced by the spellcaster generic class.
Magic closely regulated in Jorudan by the Crystal Tower. The Tower had its beginnings as a school for magic users, predating the spread of the taint into the male half of the source. It has since become the sole institution of magic users in all the known lands, and has assumed the responsibility of policing the use of Magic so that the widespread catastrophy and destruction that followed the curse can be avoided. Tower mages, all female, hunt down males with the ability to cast spells, ignoring political boundaries. No one, not even a king, is safe from the Tower if he can channel, as the learned societal fear of male casters is so great that even his own guards will stand aside and let the Tower take their master rather than suffer the madness.