Corruption Zone

Description
The Corruption Zone is the void inhabited by containment!Sans, and as such he is the one in control of its structure.

The Corruption Zone was once the location of the original UnderTale, though after its destruction it became one of the husks, and Containment!Sans was the first to find it

This place is where Containment began hoarding the souls of determination after collecting them, as he is the only living thing able to enter and exit the Corruption Zone, due to his negative health value

Appearance
It appears to be nothing more than infinite hallways suspended within a standard black void