The amulet thing is very interesting and a bit unexpected. Seems like the Void is using him to snatch up Azeroth's worldsoul. I guess it at least makes the Incarnates goal more tangible now. I don't see how they could try to take on the titans by themselves though. Unless the harbinger is a Void Lord.
The Alex / Vyranoth encounter was okay. I don't know why but comes across as awkward. I guess its nice to see Vyranoth get some personality and motivation at least.