Titans certainly became the tanks but why did they need that grenade for seems really misplaced to me and if you think about their class and what bungie says they want them to be.... It truly doesn't make sense
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Arc titan originally had the enhanced grenade node though. We could carry 2 and they all had longer durations for their effects. Although I agree it probably SHOULD have been the warlocks...it was already a part of the titans kit.