Gorribal



Gorribal the Dark Seether is a sword that was forged from one of the two Shatterbound fragments of Gorshalach. Wielded by Sargeras, this weapon embodies the darkness that exists in all beings, even noble ones. If this weapon is ever combined with the other fragment, which has been reforged into Taeshalach, then Gorshalach will be reborn, although this can only be done by a non-evil being.

Speculation
Since Aggramar's sword is still named "Taeshalach" in canon, the names "Gorribal" and "Gorshalach" could eventually find their way into canon as well. There is a trinket called Gorshalach's Legacy.