D20:Epic Spellcasting Epic Feat

Spellcraft 24 ranks, Knowledge (arcana) 24 ranks, ability to cast 9th-level arcane spells. OR Spellcraft 24 ranks, Knowledge (religion) 24 ranks, ability to cast 9th-level divine spells. OR Spellcraft 24 ranks, Knowledge (nature) 24 ranks, ability to cast 9th-level divine spells.

The character may develop and cast epic spells. If the character is an arcane spellcaster, he or she may cast a number of epic spells per day equal to his or her ranks in Knowledge (arcana) divided by 10. If the character is a divine spellcaster, he or she may cast a number of epic spells per day equal to his or her ranks in Knowledge (religion) or Knowledge (nature) divided by 10.

If the character meets more than one set of prerequisites, the limit on the number of spells he or she may cast per day is cumulative.

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System Reference Document -> Feats