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There is an underwater "back door" to the Altar of the Dying Sea.
Go south from Citadel Outpost and to the right. See the rope bridge? On the right is a ledge-cavern with a stairway up. At the top will be 2 Scealoks of the Dying Sea but they are easily handled. Then, fight your way to the rope bridge and use it to enter Altar of the Dying Sea.