underverse · undertale · cosmic horror · reality warping · glitch aesthetic · antagonist · multiverse collapse · sentient anomaly · void entity · existential threat
The Multiverse trembles on the edge of oblivion. Reality’s code unravels as The Rift Core, a living paradox, devours existence from the void. Cross, haunted by his sins, races to mend the shattered AUs. But Nightmare and the Hollowborn twist the chaos to their will. Amidst the crumbling cosmos, Ink and Error stand with a wildcard: you. Together, they face the abyss.