I have a few questions about this PrC and what happens at Epic Levels. Sorry the post is so long -- I hope someone will be patient enough to read through it all and help me understand the rules better
Assume my character is 3rd Wiz/3rd Cleric. I then start gaining levels as a Mystic Theurge. At character level 13 I am 3rd Wiz/3rd Cleric/10th MT, with spell lists similar to a 13th Wiz and a 13th Cleric, but I still only have the class abilities of a 3rd Wiz/3rd Cleric. Is this true?
At character level 14 I could gain another level as Wizard, and be 4th Wiz/3rd Cleric/10th MT, with spells lists similar to a 14th Wiz and a 13th Cleric. Is this also true?
By character level 20, I would be 7th Wiz/3rd Cleric/10th Mt, with spells lists as a 17th Wiz/13th Cleric. I am now (or will be next level) an "Epic" character, but not an "Epic" Wizard, since I'm really only a 7th level Wizard. So I can continue gaining Wizard levels and increase my Wizard class abilities without using the Epic Wizard rules -- is this also correct? The only problem is that by character level 23 (10th Wiz), my arcane spell list will be the same as a 20th level Wizard. Does this mean I can't gain any new spell slots?
Now, back to the Mystic Theurge PrC. This PrC gives the following benefits:
"Spells per Day: When a new mystic theurge level is gained, the character gains new spells per day as if he had also gained a level in any one arcane spellcasting class he belonged to before he added the prestige class and any one divine spellcasting class he belonged to previously. He does not, however, gain any other benefit a character of that class would have gained. This essentially means that he adds the level of mystic theurge to the level of whatever other arcane spellcasting class and divine spellcasting class the character has, then determines spells per day and caster level accordingly."
But the Epic Mystic Theurge (according to the SRD) is described differently:
"Spells: When an odd-numbered mystic theurge level above 10th is gained she gains new spells per day (and spells known, if applicable), as if she had gained a level in an arcane spellcasting class she belonged to previously, up to the maximum spells per day and spells known by that class. Her caster level in that class also increases by +1. When an even-numbered mystic theurge level above 10th is gained she gains new spells per day (and spells known, if applicable), as if she had gained a level in a divine spellcasting class she belonged to previously, up to the maximum spells per day and spells known by that class. Her caster level in that class also increases by +1."
The Epic MT appears completely useless! I get the same spells if I gain alternating Wiz/Cleric levels, plus the class benefits! How does this make sense? Am I missing something here?

Assume my character is 3rd Wiz/3rd Cleric. I then start gaining levels as a Mystic Theurge. At character level 13 I am 3rd Wiz/3rd Cleric/10th MT, with spell lists similar to a 13th Wiz and a 13th Cleric, but I still only have the class abilities of a 3rd Wiz/3rd Cleric. Is this true?
At character level 14 I could gain another level as Wizard, and be 4th Wiz/3rd Cleric/10th MT, with spells lists similar to a 14th Wiz and a 13th Cleric. Is this also true?
By character level 20, I would be 7th Wiz/3rd Cleric/10th Mt, with spells lists as a 17th Wiz/13th Cleric. I am now (or will be next level) an "Epic" character, but not an "Epic" Wizard, since I'm really only a 7th level Wizard. So I can continue gaining Wizard levels and increase my Wizard class abilities without using the Epic Wizard rules -- is this also correct? The only problem is that by character level 23 (10th Wiz), my arcane spell list will be the same as a 20th level Wizard. Does this mean I can't gain any new spell slots?
Now, back to the Mystic Theurge PrC. This PrC gives the following benefits:
"Spells per Day: When a new mystic theurge level is gained, the character gains new spells per day as if he had also gained a level in any one arcane spellcasting class he belonged to before he added the prestige class and any one divine spellcasting class he belonged to previously. He does not, however, gain any other benefit a character of that class would have gained. This essentially means that he adds the level of mystic theurge to the level of whatever other arcane spellcasting class and divine spellcasting class the character has, then determines spells per day and caster level accordingly."
But the Epic Mystic Theurge (according to the SRD) is described differently:
"Spells: When an odd-numbered mystic theurge level above 10th is gained she gains new spells per day (and spells known, if applicable), as if she had gained a level in an arcane spellcasting class she belonged to previously, up to the maximum spells per day and spells known by that class. Her caster level in that class also increases by +1. When an even-numbered mystic theurge level above 10th is gained she gains new spells per day (and spells known, if applicable), as if she had gained a level in a divine spellcasting class she belonged to previously, up to the maximum spells per day and spells known by that class. Her caster level in that class also increases by +1."
The Epic MT appears completely useless! I get the same spells if I gain alternating Wiz/Cleric levels, plus the class benefits! How does this make sense? Am I missing something here?
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