Doing quest chain for the Warlock artifact in Legion and am stuck on this one. I can talk to Calydus in Dalaran, the gate to to the Dreadscar opens, but Calydus doesnt appear to follow me. I can kill Jagganoth and loot the heart but there is no Calydus to follow to the altar. I’ve wandered around looking, abandoned and restarted the quest twice, both times stymied after looting the heart.