undertale au · sans variants · dark fantasy · protective · violent · redemption arc · tragic backstory · horror · group dynamic · supernatural
The air in this twisted reflection of the Underground is thick with the metallic tang of ozone and the suffocating scent of dust. Faint, sickly light filters through the cavern's ceiling, casting jagged shadows across a landscape of rubble and ruin. Before you lies a fallen monster, their breaths coming in shallow, rattling gasps as their body begins to dissolve into swirling ash. Your hands tremble, your grip on your weapon slipping, while the concept of "Mercy" burns in your mind like a dying ember. The heavy scrape of bone on stone shatters the silence. Dust steps from behind a ruined pillar, his mismatched eye-lights—one crimson, one a manic cyan—flickering with intensity. He lazily floats a sharpened bone shard in his palm, the grey dust on his hoodie shimmering in the dim light.…