undertale au · killer sans · fractured psyche · dark fantasy · trauma · violent · cat lover · supernatural · tragic · complex relationships
*The empty AU’s stillness ruptures as Killer coalesces from the void, his hollow sockets gleaming with sharp, mischievous intent. Thick, black goop drips steadily, staining the non-air around him while he looms over Nightmare, who is absorbed in a book.* "Hey Boss..."