Mystic Theurge is a combination caster allowing for people to progress in both levels at once. This allows characters to progress and gain divine and arcane spell levels and improve casting to forego other class features you may otherwise have gained

Role: Spell Support

Characteristics: A combination caster that gains level in both arcane and divine casting

Source: Dungeon Master's Guide

Game Rule Information

The Mystic Theurge has the following game statistics.

Abilities: Whatever your two primary casting stats are, or one if you use certain combinations

Alignment: Any

Hit Die: d4

Starting Gold: N/A

Class Skills

The Mystic Theurge's class skills are Concentration (Con), Craft (Int), Decipher Script (Int), Knowledge (arcana) (Int), Knowledge (religion) (Int), Listen (Wis), Profession (Wis), Search (Int), Sense Motive (Wis), Spellcraft (Int), and Spot (Wis)

Skill Points at 1st Level: (2 + Int modifier) × 4

Skill Points at Each Additional Level: 2 + Int modifier

Class Features

All of the following are class features of the Mystic Theurge.

Weapon and Armor Proficiency: A Mystic Theurge is proficient with whatever they were already proficient with

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. 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.