Have your thief hide in shadows and sneak past the umber hulks to the second cell, inside you will find an active area that you can place the dog stew in, do so and get out of there, dont go back the way you came go back via the southern corridor. When you get back to the room where the hulks were, close the door behind you, then close the other door, trapping the hulks in the prison area. (you can then kill them for even more xp if you wish)
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Magic Merlin
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