Go back to the room where you fought The Idol, and got Brother Perdium's badge. At the northernmost point in that room is a staircase, with a bunch of symbols at the base of it. Each of those symbols matches a badge you have collected. Touch each symbol, and they light up (or something), and after you've touched all six, the staircase unlocks, and you can go up. That will take you to the final part of the game.
-The Wretched
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