It's All Yours!

Flexible melee attack
Trigger: 
Natural even miss
Effect: 

This battle, your next ally to attack the target you missed gains a +2 attack bonus with that attack.

Adventurer Feat: 

That ally's attack also deals +1d6 damage.

Champion Feat: 

The damage bonus increases to +3d6.

Epic Feat: 

The damage bonus increases to +3d12.