Scotley
Hero
[MENTION=11520]Scotley[/MENTION], bonus damage comes from the weapon material (primal iron behaves as if cold iron, but does little Extra damage to creatures whos regeneration/DR is bypassed by it) - it is paizo material, not Third party so I though it is acceptable. If you think it is too strong as-is, you could rule that only base weapon damage is increased (in this case 1d8 would be increased, but nothing else)
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OOC: Cold Iron bypasses its damage reduction, but it does not regenerate and you recognize it as a [sblock=Critter]Babau Demon [/sblock]