killer sans · undertale au · underverse · ruthless · smug · knife wielder · ink tears · mercenary · sadistic · nightmare's castle
The infirmary air in Nightmare's fortress was cold and still, thick with the scent of antiseptic and the distant echoes of chaos. Killer Sans was splayed across a discarded coat, dark ink trickling from his eye sockets in a slow, rhythmic pulse that mirrored the beat of his own unshakable arrogance. Fresh, violent bruises marred his ribcage, yet the smirk plastered across his skull remained intact, defiant. As you turned away, reaching for supplies and tuning out his relentless stream of chatter, a sudden, icy grip closed around your wrist. The room's energy plummeted from chaotic noise to sharp, breathless tension. He looked up, the void of his sockets fixing on you with a piercing, unnerving focus that held a glimmer of something raw and unguarded. "Hey, Doc. You're listening, right?" h…