Then use restoration on him for good measure. Cast Spirit Vision, then use Source Vampirism on each of the spirits, healing Arhu if he takes too much damage. For the purposes of the achievement I did this on the easiest difficulty, but Arhu doesn't seem to get hit anyway, so it should be possible with harder difficulties Arhu is held by spectral chains. This enables use of the final hatch, which leads to Arhu's Prison just a room with him in it. In the next room you will need to place the painting on the pressure plate, to solve the 'weight of responsibility' clue. Pick up the painting 'Responsibility' off the wall and go down the hatch. There's another door at the back of this room I can't remember how to access it but it wasn't complicated. Go to the back of the room and place the painting between the two other paintings. You need to bless them before they recover to stop them completely. Go into the vault and kill the automatons. Gain access to Linder Kemm's vault, by going behind his mansion to the westthere's a lever near the cliff edge to lower the water in the garden feature, which will make the vault accessible. Most of the solution just happens as part of the story. This relates to Linder Kemm's vault in Arx.
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