I just got Thorn today after RNG finally gave me the quest and I have to say it feels very weak and there are so many better "legendary" handcannons out there.
I don't know if this archetype of handcannons is just in a bad place or the gun itself is bad and lackluster but I would like a reason to use it in my exotic slot. Maybe buffing the range by a little and the dot by 1 would help.
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Make Thorn like it was in Year 1, and if you have the artefact equipped, it's DoT does exactly what it does now. As it stands currently, there's no real incentive to use Thorn in PVP OR PVE.