First things first, the matter of your soul. Even if you were to somehow contact Error, you certainly weren't doing it with the condition you - and Chara, because of the fuse - were in. You had tried Riverwoman, tried different AU Sans', even at one point tried to contact Gaster. But it seemed the two of you were cut off from the world.

That is, your own world.

As you and Chara discussed the possibilities, a small child that looked quite like your friend appeared. But unlike Chara, they had large black holes for eyes, and were completely monochrome. They looked troubled, despite having little room for expression on their face.

"Wow... I wonder what happened to this AU..." they said, looking around. They quickly spotted you.

"Oh! A side character? No, not even that. A glitch in unfinished code. Isn't that sad." they said as they walked towards you. You backed up in response. After all that had happened, you knew better than to trust strangers. The Chara look-alike smiled nervously.

"There's no need to be afraid miss... L/N? I'm not here to hurt you. Quite the opposite, actually! I'm Core!Frisk."

So they weren't another AU's Chara after all. They were a Frisk. Sometimes, if it's not obvious, it can be hard to tell the two apart. You feel your muscles relax. Frisk's are usually harmless, save for Underswap.

"...What do you want? How did you get here? What AU are you from?" You ask, as Chara peeks her head from over your shoulder. Core!Frisk gives her a little wave, unfazed by your questions and completely calm.

"None of those really matter, except for what I want! I just want you to be happy. This timeline has been really destructive, but I've had to stay away because of Error. He doesn't exactly... appreciate my work." They said, scratching at the nape of their neck. A memory bubbles from the back of your mind, of Error coming home from 'work' cursing his head silly about a monochrome Frisk.

"But, we've tried countless times. There's no way for us to get out." Chara said, moving from behind you to beside you. Core!Frisk giggles. "The door to a safe timeline - the Omega Timeline - is open to anyone who wants it! You just have to open it. Well, see ya!" said Core!Frisk, disappearing before either you or Chara could ask any questions.

"Well that was... interesting. What do you think that was about?" Chara asked, looking at you. You were staring at your hands, watching the pinpoint of light float in front of you. Chara put a hand on your shoulder. "Do you... wanna try what the creepy Frisk said?" they asked.

You nodded.