Eldritchdust

Mirrored dust

Sans had began killing all the monsters in the ruins. Starting with Toriel. The only one who had a chance to alert snowdin of what was happening. It was interesting to learn how peaceful they all were. They didn't even fight back. Not a single one of them. Not even flowey. It remind him of why he should continue. To kill a monster you needed to be a 'monster'. To kill a demon you had to be a 'demon'. Just for the sake of amusement he used his telekinesis to move some of the dust near the exist of the ruins. He then made the dust spell out a message.

When he left the ruins he looked for any possible camera's that Alphys might be using. It turned out there weren't any. This would make this way easier. Sans then began to get started on the monsters of snowdin. Starting with papyrus and this dimension's sans. There was no certainty they wouldn't interfere with the plan. Even if they were much kinder than they should be. Before long snowdin became a ghost town. Nobody was able to escape. Meanwhile with frisk and chara.

All they could do was watch as every monster in the ruins turned to dust. And when they reached the exist of the ruins they found a message. "If your reading this you are mostlikely frisk or chara. if you aren't then I'm afraid your going to encounter a mad time near the barrier. If you are frisk or chara. Would you like to repeat what happened last time?, Perhaps we can discover how many dimensions our world really has ". The other frisk and chara began shuddering in fear at the message while the frisk and chara from the other dimension understood more about what was happening.

As the 2 of them became more good. Sans would become more evil. They were now conceptual opposites. like yin and yang. Chara then realized they both might need to do something drastic if they wish to beat sans. Up until this point chara while possessing frisk has never had both there souls close to each other. While she does have determination. Fundamentally she has remained a ghost for so many timelines that she could no longer remember how she died if it wasn't easily accessible information in the underground. And whether she called herself a demon or a ghost.

For this it didn't really matter. In the end all types of spirits that she knew existed had the same type of soul. That being a monster soul. Chara then carefully moved her soul in the direction of frisk's soul. Frisk then combine with chara and became a new being. Charisk. The other frisk and chara were startled by the sudden transformation. Charisk had all the good of frisk with all the evil of chara. The talents of frisk and the skill of chara. The determination of frisk and the power of chara.

Overall Charisk was a near perfect mix of frisk and chara. Though there were certain key differences between Charisk and frisk and chara in a non combine state. Her height as an example was not expected. Charisk was 6 feet tall. Her skin was also a pale ghostly shade of white. While it wasn't fully what either of them had in mind. Charisk could tell she was significantly more powerful then frisk and chara were individually. They would need help even if both of them were working together in the event they had to defeat Charisk.

They knew this from not just a sense of power and everything else. But also from the fact that Charisk had what was effectively the combined mind of them both. Yet were still able to think independently from frisk and chara. It was also kind of like a hive mind of 3 beings that share the same body. The frisk and chara of this universe followed Charisk as she traveled to snowdin. It was hard to tell based on appearance that there was snow under the layer of dust across the town. Frisk and chara were questioning how it was possible to create so much dust with just the population of snowdin.

Charisk then realized just how far the 3 of them came full circle. Her Frisk and chara were originally good people who became evil do to boredom and curiosity. In each timeline it forced sans to be the hero of the underground. And at the height of their evil made sans become partly evil in order to stop them both. Now they were both seeking redemption while sans became evil. It was almost like a cycle. A dualistic cycle that would be hard to remove.