Okay, I really like the two "Theurgic" feats Cheiromancer came up with, and one is exactly the same concept as I was trying to achieve
here. However, I think the "Theurgic" feats should be a little harder to qualify for, plus I want bards and sorcerers to be able to qualify for these feats.
Anyway, here are my World of Kulan versions, plus 3 new feats to chain in.
Theurgic Adept [General]
By Cheiromancer – modified for World of Kulan
Your arcane and divine caster levels stack when determining caster level.
Prerequisites: Int 15, Wis 15, Cha 15, Knowledge (arcana) 6 ranks, Knowledge (religion or nature) 6 ranks, ability to cast both arcane and divine spells, Mystic Insight or Insight into the Green.
Benefit: Your arcane and divine class levels stack (to a maximum of your character level) for the purpose of determining your caster level. This does not affect your spells known or your spells per day.
Theurgic Focus [General]
By Cheiromancer – modified for World of Kulan
You gain a divine/arcane gestalt level, in the future.
Prerequisites: Int 13, Wis 13, Cha 13, ability to cast both arcane and divine spells.
Benefit: At some future time when you advance a level, choose an arcane class and a divine class you have levels in. You may take a gestalt level in these classes.
Special: If you use a rule variant that allows a limited number of gestalt levels then the gestalt level gained by this feat counts as a level of a base class.
Theurgic Savant [General] (NEW)
You gain a bonus on your theurgic arcane and divine spells' save DCs.
Prerequisites: Int 17, Wis 17, Cha 17, Knowledge (arcana) 8 ranks, Knowledge (religion or nature) 8 ranks, ability to cast both arcane and divine spells, Mystic Insight or Insight into the Green, Theurgic Adept.
Benefit: You gain a +2 insight bonus on all save DCs for your chosen theurgic arcane and divine classes' spells.
True Theurgist [Epic] (NEW)
Your arcane and divine caster levels stack when determining number of spells.
Prerequisites: Int 19, Wis 19, Cha 19, Knowledge (arcana) 20 ranks, Knowledge (religion or nature) 20 ranks, ability to cast both arcane and divine spells, Mystic Insight or Insight into the Green, Theurgic Adept, Theurgic Savant.
Benefit: Your arcane and divine class levels stack (to a maximum of your character level) for the purpose of determining your normal spells known and your normal spells per day, but not for any epic spells.
Epic Theurgist [Epic] (NEW)
Your Knowledge skill ranks stack when determining number of epic spells.
Prerequisites: Int 21, Wis 21, Cha 21, Knowledge (arcana) 25 ranks, Knowledge (religion or nature) 25 ranks, ability to cast both arcane and divine epic spells, Mystic Insight or Insight into the Green, Theurgic Adept, Theurgic Savant, True Theurgist, Epic Spellcasting.
Benefit: Your Knowledge (arcana) and Knowledge (religion or nature) ranks stack (to a maximum of 100 ranks) for the purpose of determining your epic spells per day.
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I'm going to crosspost the New feats on my Theurgist Feats thread.