Damage Empowerment??

[pepper22]

My question is, how does damage empowering actually work? WHat I mean is, does the + to damage add in after the attack or straight into the skills damage. For example if I empower a skill that does 10-20 damage and the empowerment adds 2 damage, then is is my damage 10-22 or 10-20 +2 damage(after the fact)??