Aura of Force (3.5e Feat)
From D&D Wiki
Aura of Force [Class]
You are able to project an aura around your shaped items of pure force
Prerequisite: Boneshaper level 6, Shape bone class feature, 15 constitution
Benefit: You may have a weapon deal an additional 1d4 force damage to targets. This effect damages incorporeal creatures even if you miss due to miss chance. You can also add the enchantment bonus (if any) of your shaped armor to your touch AC.
Special: This effect can be applied to a shaped weapon that already deals a type of energy damage( fire, cold, electric, or acid)