I personally think that the ability of this grenade to completely shut down an active super is too OP. Even in Destiny 1, the only thing that was able to do this was the nightstalker's bow, and it was a super. So i found having this ability with only a simple grenade is too much for the balance. I hope that I'm not the only one who thinks this.
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What the hell are you talking about? The Suppressor Grenade was there long before Nightstalker was even a concept, and always had the ability to suppress a target's abilities, including Supers, to make up for the Defender's lack of offensive capabilities. It's functioning the same way it did in Destiny 1.