A number of materials grant nonmagical enhancement bonuses to damage.
- Byeshk gives +1 damage to a bludgeoning weapon for 1500 gp.
- Blue Ice gives +1 damage to a slashing weapon for 500 gp.
- I seek to recall Starmetal or something like that giving a full on +1 enhancement bonus, complete with bypassing DR and hitting incorporeal creatures, all without being magical.
Are there any other materials or properties that do this sort of thing?