Is there a difference between the damage types other than what color energy shield they work better on? Because if there is, I honestly can't tell. Arc damage should arc between grouped enemies like lightning. Solar should do damage over time like fire. Void should... I don't know. What is the lore behind Void in this game? It should do that. It kind of looks like a black hole. So maybe it should pull other enemies towards the the one that you hit, setting them up for massive grenade damage. Or it could be like Slag in Borderlands 2. It doesn't do much damage on it's own, but it makes them take more damage from Kinetic type damage.