The Black Soulstone essence is screaming for vengeance and release. Before the artifact can be sealed away forever, Malthael, the Angel of Death manifests in the mortal realms with a deadly new purpose. And so begins the end of all things.
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Despite the nudity of the succubi, no organization has asked Blizzard to make a "censored" version of the creature due to the games M rating, which allows for nudity and gore. See more
[just before the final battle
Nephalem... the Black Soulstone journeys through the portal to Sanctuary. Even now, it spreads Death across your world. And so ends... the Eternal Conflict.
References The Big Lebowski