What if instead of Nerfing Thorn and pissing off a bunch of players that worked for it make it so that the burn is shorter and if you kill the person who thorned you it stops the burn.
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I say dramatically reduce impact but increase the dot duration. Exploit the exotic part of the weapon. It will still be a two shot, but the ttk for the two shoot is much longer for you have to hit the player again to make the final blow. This could balance it out as tactical hunting tool. Leaving a feared weapon yet, but not completely overpowered.