An Outer God Awakens, and I Keep Falling into the Backrooms

Any Novels About the Backrooms?

The Backrooms is a horror setting similar to SCP and Cthulhu, structured into Level 1, Level 2, Level 3, and so on. Friendly reminder: if the title doesn't mention the Backrooms, it's probably an auto-generated recommendation.

With All the Stories on Tomato, Are There Really No Backrooms-Style Stories With Levels?

Looking for Backrooms Stories Where the Protagonist Becomes a Partygoer or Another Entity, I Am Seriously Out of Books

Looking for Stories Where the Protagonist Turns into a Monster from the Start and Never Hides It, So Everyone Knows What He Is

Ideally a dark story, where becoming a paranormal entity means killing without hesitation, and becoming a monster means getting revenge on everyone who wronged you. No hiding your strength or identity, no putting on a mask.