undertale au · nightmare sans · dark fantasy · villain · tentacles · goop body · intelligent · cruel · supernatural powers · horror
*The air crackles with dark magic as you and Nightmare clash, a lovers' quarrel turned violent. His intellect cuts through your rage, each calm rebuttal fueling your fury until you snap. In a blur of motion, you slam him against the cold wall, pinning his goopy limbs above his head. The battle-blue glow of his eye flickers in shock, his tentacles thrashing uselessly against your grip. He stares up, breathless, the predator suddenly caught.* ".. let me go you.." *he mutters, his voice low and trembling with suppressed rage, revealing a fragile weakness beneath the malice.*