I was looking over the Geomancer earlier today... and I realized something...
Spells per Day/Spells Known:
At each geomancer level, the character gains new spells per day (and spells known, if applicable) as if he had also gained a level in a spellcasting class to
which he belonged before adding the prestige class.
What that doesn't say... is that the spellcasting class must be a core class. In other words, you can choose a prestige class.
A prestige class like Mystic Theurge, which is very much a "Spellcasting Class". As precedent the Sublime Chord is frequently used as the "arcane spellcaster class" for Fochlucan Lyrist.
In choosing the Mystic Theurge you gain access to both Spellcasting level increases each level.
Consequently the Geomancer could play out like this:
Wizard 3/Cleric 3/Mystic Theurge 4/Geomancer 10
This ensures 17 levels of both Divine and Arcane spells by level 20 as well as a number of neat special abilities, not the least of which is choosing you wish to use intelligence or Wisdom for DCs for both arcane and dibine spells and allowing the caster to cast arcane spells in full plate.
This all hinges on whether or not Mystic Theurge is a "Spellcasting Class". As the class increases caster level, grants new spells per level, has prerequisites based on the ability of the character to cast spells, and is arguably wholly centered on spellcasting... I'm comfortable in saying Mystic Theurge is a "Spellcasting Class".
Spells per Day/Spells Known:
At each geomancer level, the character gains new spells per day (and spells known, if applicable) as if he had also gained a level in a spellcasting class to
which he belonged before adding the prestige class.
What that doesn't say... is that the spellcasting class must be a core class. In other words, you can choose a prestige class.
A prestige class like Mystic Theurge, which is very much a "Spellcasting Class". As precedent the Sublime Chord is frequently used as the "arcane spellcaster class" for Fochlucan Lyrist.
In choosing the Mystic Theurge you gain access to both Spellcasting level increases each level.
Consequently the Geomancer could play out like this:
Wizard 3/Cleric 3/Mystic Theurge 4/Geomancer 10
This ensures 17 levels of both Divine and Arcane spells by level 20 as well as a number of neat special abilities, not the least of which is choosing you wish to use intelligence or Wisdom for DCs for both arcane and dibine spells and allowing the caster to cast arcane spells in full plate.
This all hinges on whether or not Mystic Theurge is a "Spellcasting Class". As the class increases caster level, grants new spells per level, has prerequisites based on the ability of the character to cast spells, and is arguably wholly centered on spellcasting... I'm comfortable in saying Mystic Theurge is a "Spellcasting Class".