Bane of the Powerful

Bane of the Powerful is a Legendary Gem in Diablo III. It can only be socketed into Amulets and Rings, and drops from Greater Rift Guardians.

It gives a temporary multiplicative boost to damage after killing an Elite monster pack. All enemies in the pack must be defeated before the gem's buff will activate. This includes Champion Minions if the pack included a Rare Monster. If you die while under the effects of this gem's buff, you lose the buff. Upgrading increases the duration.

This pairs well with Nemesis Bracers, which generate more elites to keep the damage bonus going.

At rank 25, it also gives a healthy bonus to damage against elites and damage from elites reduction.

Bugs
In 2.1.0, this gem's effect triggered whenever player killed an Illusionist affix illusion.