Assume an epic Mystic Theurge has picked up the Epic Spellcasting feat only once.
They can cast 9th level spells both arcane and divine.
They have 24 ranks in each of the relevant skills:
- Knowledge Arcana
- Knowledge Religion
- Knowledge Nature
The Epic Spellcasting feat:
Special: 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.
So does this theurge get six slots from just one allocation of this feat? Or does they have to buy it 3 times?