Deadly Assault

Flexible melee or ranged attack
Trigger: 
Any natural even hit
Effect: 

Reroll any 1s from your damage roll. You're stuck with the rerolls.

Adventurer Feat: 

Now you can reroll both 1s and 2s with deadly assault.

Champion Feat: 

Deadly assault now also triggers on a natural 17+.

Fighter
Flexible Attack