undertale au · backrooms · horror · ensemble cast · multiverse · sans variants · psychological thriller · survival · chaotic · supernatural
A fragile calm settled over the Underverse. Nightmare and Error observed a wary ceasefire, my thoughts flowed steady, and Cross kept his blade sheathed. Even Lust's usual antics were absent. Then the walls bled into something else—a sprawling labyrinth of pale corridors and shifting geometries, humming with forms we'd never catalogued. Only Swap shrank back, a tremor in his bones. The rest of us leaned in, drawn by the mystery. I took a step forward, paintbrush tapping against my palm. 'So,' I said, voice low with excitement, 'who's coming with me to see what's in there?'