The Reign of Darkness
And some things that should not have been forgotten were lost…
This later turned out not to be the truth of events, as Yasir’s death had been faked and he escaped Threshold to travel south with the Orb. It was somewhere in the Foamfire Valley where Lord Pizentios caught up with the elementalist, took the Orb for himself, and enslaved Yasir. Pizentios then used the Orb as part of his ritual to become a lich, using it to channel the necrotic energies of the Shadowfell. When the Shadowguard destroyed the phylactery Pizentios had incorporated the Orb into, the Orb subsequently disappeared like so much black smoke and its current whereabouts are unknown.
The Obsidian Orb is an artifact of great power over shadow and necromancy which it offers to those willing to wield it. However, there is a malevolent consciousness within the Orb and those who possess it over long eventually succumb to its dark influence.