Transmutation
Level: Dragon 3, Druid 3, Incarnate 3, Mystic Ranger 3, Ranger 3, Scalykind 3, Urban Druid 3
Components: V, S, DF
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One living creature
Duration: 1 hour/level
Saving Throw: Will negates (harmless)
Spell Resistance: Yes (harmless)
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.
Source: Player’s Handbook (Page 250)