Requirements
Spell casting: Ability to cast 7th level arcane spells, knowledge of 5th level or higher spells from at least five schools.
Skills: Knowledge (Arcana) 15 ranks, Spellcraft 15 ranks.
Feats: Skill Focus (Spellcraft), Spell Focus in two schools of magic.

Class Skills
Alchemy (Int), Concentration (Con), Craft (Int), Knowledge (Int), Profession (Wis), Scry (Int), Search (Int) and Spellcraft (Int).
Skill Points at Each Level: 2 + Int modifier

Class Features
Weapon & Armor Proficiencies: Arcane devotees gain no proficiency in any weapon or armor.
Spells per Day: An arcane devotee's training focuses on arcane spells.  Thus, when a new arcane devotee level is gained, the character gains new spells as if she also gained a level in whatever spell casting class she belonged to before he added the prestige class.
High Arcana: The archmage learns secret lore, unknown to lesser wizards and sorcerers.  She gains the ability to select a spelcial ability from among the following by permanently eliminating one spell slot.
Arcane Fire (Su): Fire a bolt of arcane power as a ranged touch attack (400'+40'/level) that does 1d6 points of damage per level of archmage and 1d6 points of damage for the spell level used.  This ability costs one 9th level spell slot.
Arcane Reach: The archmage can use touch spells on targets up to 30 feet away.  The archmage must make a ranged touch attack.  This ability costs one 7th level spell slot.
Mastery of Counterspelling: When an archmage sucessfully counterspells, the spell is turned back as if hit by a spell turning.  This ability costs one 7th level spell slot.
Mastery of Elements: The archmage can alter the element present in a spell.  Causing a fireball to do sonic damage for instance.  This ability costs one 8th level spell slot.
Mastery of Shaping: The archmage can alter the shape of spells that use the following descriptions; burst, cone, sylinder, emanation or spread.  This ability costs one 6th level spell slot.
Spell Power +1: This increases the DC for saving throws against the archmages speslls and caster level to overcome spell resistance by +1.  This ability costs one 5th level spell slot.
Spell Power +2: This increases the DC for saving throws against the archmages speslls and caster level to overcome spell resistance by +2.  This ability costs one 7th level spell slot.
Spell Power +3: This increases the DC for saving throws against the archmages speslls and caster level to overcome spell resistance by +3.  This ability costs one 9th level spell slot.
Spell-Like Ability: The archmage can use one of her arcane spell slots to permanently prepare one of her arcane spells to use as a spell-like ability twice per day.