it's a dps gain, but only in short term - the DPE is the same. It's not useful at all.
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i take back what i said, Ensanguinate is a farming alternative to using envenom....on a 45 second cd.
edit:
just saw that celeshiton tried to explain himself, saying bloodsweat was too strong (maybe in sustained aoe situations) and that assassination base aoe will be buffed.
We shall see.
It wouldn't be so bad if they didn't replace blood sweat with such a garbage talent