Bearded devils (page 73 in the Bestiary I) have a special attack called "beard" that does not require an attack roll (more precisely, it requires both claw attacks to hit). How does this interact with an amulet of natural fists with a special quality like bane?
The beard does damage, along with a disease, but since it doesn't require an attack roll, I am inclined not to apply the extra damage. Plus, doing 3d6+5 damage from each claw (1d6+4 from the claw plus 2d6+1 from bane), and plus 1d8+2d6+3 damage from the beard (1d8+2 from the beard, plus bane)seems like a lot of punishment for my heroes.
What are yawl's thoughts?
I'd say that Barbazu's beard is special ability and not a natural attack and thus do not gain bonus from amulet of mighty fists. The same would apply for constrict and probably rend. Compare to rake special ability description that specifically states defines rake as natural attack.