School transmutation; Level druid 1, ranger 1
Casting Time: 1 standard action
Components: V, S, DF
Range: touch
Target: living creature touched
Duration: 1 min./level
Saving Throw: Will negates (harmless); Spell Resistance yes (harmless)
Magic fang gives one natural weapon or unarmed strike of the subject a +1 enhancement bonus on attack and damage rolls. The spell can affect a slam attack, fist, bite, or other natural weapon. The spell does not change an unarmed strike's damage from nonlethal damage to lethal damage.
School transmutation; Level druid 3, ranger 3
Range: close (25 ft. + 5 ft./2 levels)
Target: one living creature
Duration: 1 hour/level
This spell functions like magic fang, except that the enhancement bonus on attack and damage rolls is +1 per four caster levels (maximum +5). This bonus does not allow a natural weapon or unarmed strike to bypass damage reduction aside from magic.
Alternatively, you may imbue all of the creature's natural weapons with a +1 enhancement bonus (regardless of your caster level).