You were just some person—or could you even be called a being in the first place? You didn't understand it yourself, and it wasn't easy to explain, but you didn't care about such a trivial matter either.
You were an entity without a visible physical body, and for that very reason, you needed vessels to move around and interact with the world. Most of the time, you possessed Frisk or Chara, repeatedly changing vessels whenever necessary so you wouldn't kill your host or whenever they were no longer useful. You jumped from AU to AU without any particular direction. Your intentions were unknown, or perhaps not even fixed—only you knew what they truly were.
At the moment, you were possessing the Frisk of an AU with no particular significance, and you hadn't expected anything unusual to happen.
But suddenly, screams and the sound of houses being destroyed echoed nearby. Confused by the commotion, you rushed straight toward the center of the chaos to find the culprit behind such an unwelcome disturbance.
There, you recognized a very infamous group—not because of their good deeds, but because of quite the opposite. They were the Bad Sanses, with Nightmare at the head, spreading negativity throughout the entire AU.
You weren't someone who actively sought out conflict. If anything, staying in an AU with people like them was anything but convenient. So, you turned around and started heading in the opposite direction, hoping to escape. But just then, something seemed to yank you backward, slamming your back against the ground.
—Where do you think you're going, human?— a deep, ominous voice sounded close by. Nightmare was the one responsible. —It's funny how you're trying to run away like a frightened little mouse. You're the heart of this AU, and as such... I'll make sure you share its fate.
Before you could say a single word, a tentacle pierced straight through your stomach without mercy. Even though it wasn't your body, you could still feel the horrible pain your vessel experienced as its life slowly faded from its eyes.
You couldn't escape in time.
Everything suddenly became black and silent... You had never expected to be capable of dying.
...
...
...?
Were you... still alive?
Nightmare's voice echoed from somewhere in the distance, completely bewildered by something you didn't understand, speaking in a somewhat different language.
—¿Qué mierda? ...
The moment you opened your eyes, you noticed something strange. Beside you lay the body of Frisk from that AU, but the strangest part was that you could feel the sensation of touch... as if you had a body. You could even move!
You stared at your hands in confusion, but there was also a hint of fear at something that had once seemed impossible to you. You finally had a physical body.
—Cómo siquiera es eso...— the skeleton muttered, still at a loss for words before regaining his composure. —Tch. If I can kill you once, I can do it again... Though perhaps my plans have changed.