This feels... breakable. I understand it's only from one discipline, and your diety must have the weapon group among their favored weapons, but think of a Cleric of Irori using monster self-buffs plus advanced knowledge of Broken Blade. He even keeps a domain and the extra spells. I also assume you use full initiator level progression, though this is not spelled out in the document.
Needs extensive testing, in other words, and don't be scared to apply the nerfbat if need be.