Way to Increase Damage to Opponent?

Is there any character or action which would allow me to increase damage done to an opponent from a character's abilities? Suppose that I have Storm - Extra Lightning (While active, when you use an action die, deal 1 damage to target opponent or target character die.) active. Then I use an action die and do 1 damage to my opponent. Is there a way to increase that 1 damage to 2 or even more?