I had the same issue, logging out and restarting the quest fixed it. Trahearn is the one that talks to the avatar so make sure he’s not far behind you.
Same with Eredon Terrace. It seems the whole area is bugged, the dynamic event next to the skill point (Clear Risen from the Stone of Hazaan) is also stuck. The wyld hunt is just running in circles and there’s no undead spawning.
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