The Undusted dark

Description
The Undusted dark is a secret area in Hollownest for the Forgotten knights dlc built by the ancient cavillation to contain void and can only sustain void similar to the Black egg. This is where the four vessels retreated, and where the dark-nest rested.

How to enter
The Undusted dark is entered through the left of Dirtmouth in the corner and through a tunnel, which only will show after the void heart has been obtained. After going in, there is a crack in the background and can be interacted with, then void tentacles will reach up and grab the knight. void will be rising from the ground until the background is all black, then six eyes will show resembling the shade lord, then the knight will be teleported to the dusted dark. The next time the knight enters, the crack will be gone and instead there's a cracked head of the knight and interacting with will instantly teleport the knight.