This would be fun ...
Eliminate all sacred weapon scaling damage, and implement this instead ...
[b]Faith in Arms[b]
Once per round, if the warpriest rolls a natural "20" in combat while using his deities favored weapon, he may select one of the three following benefits
1) As a swift action, replenish a fervor point if one has been used today.
2) This weapon hit bypasses any DR the target may have.
3) This weapon hit may add your wisdom modifier to the damage roll.
