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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Honestly it's totally okay that titans got a grenade aspect, the problem is that they got an improved storm grenade - which was an exclusive grenade for storm caller since destiny 1. That's why warlock mains are a bit upset, that grenade was tied to the identity of warlocks for so long. The other problem is that it's incredibly too strong, the damage output is ridiculous considering all you have to do is equip the aspect and that's it. I don't even think a warlock with verity's x5 and pulse grenade's damage would even come close, and that requires setting up (plus an exotic armor piece).