Let Thresh grant 2x the super amount than usual if your equipped subclass element matches the guns element.
The weapon perk itself doesn't work in pvp, so there is no loss to be gained.
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The problem is it was made for the old super system. Now that our supers are based on the damage we are doing, it is hard to say what is thresh and what is just a chunk of super you are getting from the massive damage you just did or the bump from the kill. Say I kill a champion. Well damaing champions give you significantly higher bumps for super. Bosses give you MASSIVE super energy I have tried tresh but with supers being changed to this, I really can't say Thresh actually gave me a noticeable difference in super energy, if it even -blam!- works after they reworked supers. I doubt it even works and Bungie just left it cause they are lazy af.