You know, the Pit Lord that Illidan chained up and have his blood drained to create Fel Orcs? The one demon who probably has the most personal grudge against Illidan? The Pit Lord that, according to all sources, "is so powerful that not even Illidan can beat if not for Kael and Vashj"
We killed him in TBC in Hellfire Citadel, which means his soul got sent to Nether and he's likely alive now. But so far in Legion there isn't a sight of him, not even in 7.2 (As far as I can tell). Instead, we got other Pit Lords like Brutallus and Azgalor.
Did Blizzard forgot about him or what?