Absol

The first time you'd miss in combat, roll a d20, add that much damage to your next attack

A storm brews when entering combat. When making an unarmed strike, deal an additional KEY lightning damage. If you miss, you take KEY lightning damage. If you go a round without landing any unarmed strikes, you and your nearest ally take KEY lightning damage. The storm can't be controlled, you are merely the lightning rod collecting the energy.