Under each one of them you could find a hatch that leads to a secret room.
However, to get to get there, you need a password.
you could find it inOrnate Hymnalbook.
An additional quest awaits you in each one of them.
These quests areDelusions of Grandeur,Bound By PainandThe Silent One.
You must complete them to finish this quest.
Their descriptions can be found in the dedicated chapters.
You must fix a lever in two out of the three rooms.Craft Silver Lever Shaft.
you could do that near Ancient Forge and combine it with a silver ingot.
Visiting the fourth room is also required to complete this quest.
However, that room is unfinished.
It is located near the harbor to which the Black Ring came.
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