You have to use Sidon's ability and then "attack" the watermill to start themdid someone clear the watertemple? what are those "watermill" for and how can i start them? Sidion isn´t a good help
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Have you done all the quests leading up to this? It should be the Clues to the Sky quest that gives you the king's scale.kingscale? I don't have that item I think where did you get it