Would I be able to apply extra damage to the adjacent enemies that take the collateral damage? Or both the target and adjacent enemies? Or only the target?
At-Will Arcane, Elemental, Implement, Lightning
Standard Action Close blast 3
Target: Each enemy in the blast
Attack: Charisma vs. Reflex
Hit: 1d8 lightning damage, and one enemy adjacent to the target takes lightning damage equal to your Charisma modifier.
Promise of Storm
Encounter Lightning, Thunder
Minor Action Personal
Effect: Until the end of your next turn, you deal 1d8 extra damage when you hit with a thunder attack or a lightning attack.