How is it a buff? It would only effect PvE games and only against that element type shield. In a nightfall worry that elements burn it would be extra effective as well. In PvP it would only look cool. I think it should be a selectable perk. Similar to the (too early, drawing a blank... Oryx's exotic scout). The last bullet would be elemental and unlimited however it will drain your super. Not sure what the other "sacrificed" perk would be.