Align Fang(Spell Compendium, p. 8)
Transmutation [see text]
Level: Druid 2, Ranger 2,
Components: V, S, DF,
Casting Time: 1 standard action
Target: Living creature touched
Duration: 1 minute/level
Saving Throw: Will negates (harmless)
Spell Resistance: Yes (harmless)
Align fang makes a creature's natural weapons good-, evil-, lawful-, or chaotic-aligned, as you choose. A natural weapon that is aligned can overcome the damage reduction of certain creatures, usually outsiders of the opposite alignment. This spell has no effect on a natural weapon that is already treated as being aligned, such as the claw or bite attack of most demons.
You can't cast this spell on a manufactured weapon, such as a sword.
When you cast this spell to make a natural weapon good-, evil-, lawful-, or chaotic-aligned, align fang is a good, evil, lawful, or chaotic spell, respectively.