Truth used to be it... it was a godsend in vault of glass when I'd get swamped with mobs or minotaurs... but I'm so much higher than that stuff now I don't use it at all ever anymore. Ice breaker I guess would have to be it, simply because there have been times where I full on ran out of ammo in no-ammo respawn maps and it allowed me to finish off a fight. Fatebringer has pretty much taken over everything for me but it's not exotic soz...