I am considering building a Barbarian with lesser and regular fiend totem. Basically whenever someone strikes me they take 1d6 points of damage from these spikes that surround my body. If I have an amulet of mighty fists, would it increase the damage?
Since it is not a natural attack (you cannot actively use it to attack) but a defensive ability (compare to the howler's quill defense or the barbed devil's barbed defense) I'd say no.