Ok I really like this idea but why change sunsinger? Why not have a arc warlock called archangel or something where your super is where you pull out a healing gun that you shoot at teammates. The perks could change whether it's after a full heal they'll gain a shield or you can change it to a offensive class that also has a aoe around the original guardian that hurts nearby enemies. ( on top of the healing gun) the aoe could be a little stronger than solar grenades per tick but balance so it's not to op!