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Collect four Clay golem hearts from the Clay golems inside of the zone.
This can be done at any time prior to or during this quest. They are chest drops so I suggest doing this first; it should only require killing four golems. You will need the 4 hearts for the final steps.
You MUST have the 4 clay hearts before you start this step!
Make your way up the passage to the top room.
There will be four idols around the center altar. Place a Clay golem heart in each one.
After placing any heart, two Ancient Thulian terrorfiends will spawn
After all four hearts are placed, Fright will spawn on top of the central altar, along with four friends. Each is a single encounter so try to clear the friends first.