I got an Arc rocket with cluster bombs from the Nightfall recently, I thought about it a moment, and than trashed/sharded it. If it doesn't have tracking, I don't want/need it. I have other/better options in Thunder Lord and a good Arc machine gun for handling my heavy. I'm hoping the Iron Banner one isn't the only way to get that perk and element on a launcher though. Because, I would like to level up a good tracking Arc RL.