Malthael, the arch angel of death is coming to the Nexus. That means yet another assassin in Heroes of the Storm, but that should be easily forgivable since it is Malthael we're talking about here, right? You can read more about Malthael and his Heroes of the Storm abilities over on Battle.net:
"Once the Aspect of Wisdom, Malthael abandoned heaven after the Worldstone's destruction. In secret, he had resolved to end the Eternal Conflict by becoming a Reaper of Souls and eliminating everything affected by demonic corruption, including humanity."