Upon killing the warden and opening the chest there is no reward. The quest does not complete and even worse the exit from the area does not appear. Unless you are VIP and can set a sign post you are stuck in the cave excepting self defeat and then back tracking to exit.
This has been broken for a lomg time and even abandoning it only makes it the oly available quest to be gotten from Linu. It makes it much difficult to play legacy campaigns when lair quests are broken.
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