[Faceman]

SPOILER
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You have to kill one of the demons and grab his heart.
Then reassemble the Golem with the arm and the head, use the coal
in the furnaces and kill the fire elementals. Now make your way to the navigation room (south of the four symbols you have to activate in the right order) and defeat Lavok. Now to the NE and deal with Tolgerias, his Apprentice and some monsters, just to end up in a Golem battle and place the Demon's heart in the main golem which will take you home.