Huh. Just realized you could get this on almost any creature by taking 10 levels of Elemental Savant, then the template. You lose all your class levels, getting reset to your base race, but keep the template. That would obviously be terrible for an existing character, but would make for an interesting backstory for a new character; a once powerful caster brought low and made into a servant by a necromancer with a cruel sense of humor, now out to escape/get revenge.