QFT. Keep in mind that if someone takes 20 levels in this class, that's some intense dedication. Wishes and Miracles are happening, swordsmen are flying killing twenty people with a single attack roll, and rogues are only seen when they want to be seen, dealing absurd amounts of damage with an absurd number of attacks. All the effort that spellcasters have been putting into spells, this guy has put into his magic sword. It needs to be worth it.