So idk if this will ever be changed but the Voidfang warlock exotic does not spawn you with full grenade energy when you have two grenades. It only spawns you with one and resets the second grenades cool-down. Even if you only threw one, it will still keep you at one and reset the second one after death.
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I was thinking about this. You answered my question. I was wondering if you paired it Memory of Felwinter. Bummer, but I guess it would be a bit OP if you respawned with two grenades every time. That, with maxed discipline would mean you could lay down 20+ grenades a match with ease. Wow.