Magic Fang, Greater
This material is Open Game Content, and is licensed for public use under the terms of the Open Game License v1.0a.
This spell functions like magic fang, except that the enhancement bonus on attack and damage rolls is +1 per four caster levels (maximum +5).
Alternatively, you may imbue all of the creature’s natural weapons with a +1 enhancement bonus (regardless of your caster level).
Greater magic fang can be made permanent with a permanency spell.