Mystic Theurge and another spellcasting PrC

[Kyros Pyralis]

Is it possible to use the "+1 level of existing class" spellcasting progression to increase the progression of a PrC that progresses multiple types of spellcasting?

For example:
I am a Wizard 4/Cleric 4/Mystic Theurge 2 (ECL 10). From ECL 10-11 I wish to train as a Spellsword. Can I use the Spellsword's "+1 level of existing arcane spellcasting class" feature in order to raise my Mystic Theurge casting capacity, resulting in an increase in both Cleric and Wizard spellcasting?

If that does not work due to the divine casting element, what about an Eldritch Theurge? This is a combination of Wizard/Sorcerer and Warlock, essentially combining 2 forms of arcane casting. Can I take a level in Spellsword and increase both Warlock and Wizard spellcasting by increasing Eldritch Theurge spellcasting, since it is an arcane class that can increaase both?

Note: Warlock is found in Complete Arcane; Eldritch Theurge is found in Complete Mage; Spellsword is found in Complete Warrior.

 

[rgard]

Sorry, but no on all scenarios.

In the Spellsword case you are advancing one level in your arcane casting class. That would be your Wizard or Sorcerer or Beguiler or other arcane casting class. The divine casting class is not part of this.

For all the PrCs I've seen (bar the theurge types which specifically advance both) the quote from the text is something like this:

"If a character had more than one arcane spellcasting class before she became an <insert PrC name>, she must decide to which class she adds each level of <insert PrC name>, for the purpose of determining spells per day."

So that would rule out Ultimate Magus as well as Eldritch Theurge.

 

[irdeggman]

From the Mystic Theurge entry:

. If a character had more than one arcane spellcasting class or more than one divine spellcasting class before he became a mystic theurge, he must decide to which class he adds each level of mystic theurge for the purpose of determining spells per day.

I believe that the Eldritch Theurge entry is the same.

 

[Kyros Pyralis]

I suspected as much, I just hoped that there was some esoteric little rule somewhere out there that let this happen. Thank you for the confirmation.