They made it so that that the DoT (Damage over Time) now stacks up to 5 times. Since they nerfed the actual amount of damage that the Thorn's Mark of the Devourer does with one stack and your opponent will be dead with 5 shots in PvP, they increased the time to kill with Thorn in PvP while increasing the amount of damage from the DoT in PvE.
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.......I'm playing the shit out of this gun before this happens. Then I'm dismantling it.