A feral druid is roughly 55% dots on single target at the moment, with a 40-50% crit rate (remember it's a 2 way buff, your crit rate is important for increasing the warlocks DPS)
A shadowpriest runs at roughly 70% dots
On an add intensive fight where a moonkin can tab target insect swarm/moonfire their dots are roughly 70-75% of their damage
On single target fights it should be on a shadowpriest then feral druid
The spell does absolutely nothing on a tank.
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