What if: Glitchtale\Multiverse

Final Reckoning of HATE. Quest for Emeralds. God vs Devil.

This enraged Sans. He saw Flowey, his dad and everyone faces, which only intensified his hatred and anger for Chara. He stood there, while Chara taunted him and Flowey. She better not have done that. You damn Sans. He was truly angry and hateful right now. He never accepted anyone hurting any of his friends, especially his family. He was ready to rip apart anyone being crazy enough to hurt his family. Suddenly Sonic Sans was engolved with a dark aura surronding his body. This shocked Frisk, Flowey and even Chara herself. His appearance changed. he became fully black or dark, while his eye-sockets became completely white(like Dark Sonic). This is Dark form of Sans. We will call this either Dark Sans or Dark Sonic Sans. 

He looked at Chara with unreadable expression. She backed away a little feeling his gathe of negativity making her uneasy, even so she also made from negative feeling. She decided to talk a bit. 

Chara: Interesting change of look Sans, but this will not help you kill me, you know. She said, but got not reply. She almost thought that Sans in not here. However she felt pain in her sides, here Dark Sonic Sans smacked her hard to make her break the wall in half. She harked out blood from this attack. She eyed Sans with fear. It was not the same person anymore. e wanted her dead like really. 

He then curled into ball, while charging up energy. This form made him massively stronger than his base state, which already was enough to make Chara go away like a fly. Now she was not even an atom before something truly big. He rushed at her with all this energy being capable of destroyed multiple galaxies, perhaps even entire universe. He slammed into Chara creating large explosion, which destroyed most of room, but did not get to Frisk, Flowey and beaten Gaster. 

Frisk and Flowey covered their eyes to not harm them. They saw Sans who still was in his Dark form. Frisk decided to make him stop. 

Frisk: Uncle Sans, please regain control of yourself. Frisk pleaded, which was heard by Sans. Who had momenterilly lost himself to his Dark Form, it not like he couldn't control it entirely, btu negative emotions of this form were too much for him as it seems. He returned to his base form, but he kneeled onto ground. He was supported by Flowey who transported him to safer place. 

Flowey: What was that Sans? Did you manage to make her disappear forever? Flowey asked not knowing what Sans did and what happened to him. 

Sonic Sans: I don't know something changed, when I saw my dad hurt. I experienced rage and hatred. Something pushed me, maybe it's emeralds power, but I maanged to go into a state, where I felt a lot of negative emotions. It made me stronger, but more agressive and dark as well. I lost my control cause of this immense emotions coming through me like a tsunami. Sorry about that.

Both Flowey and Frisk understood. Also it seemed that Sans exhausted his body by transforming into that called it Dark Sans or Dark Form, due to it being dark and formed by dark feelings. However Chara was not dead her soul refused. 

Chara: Hehe Asriel. Do you know what black means? It means HATE. Chara exclaimed making Flowey turn to her direction he was only one that could fought her off. Sans was off for some time, cause of his previous transformation to Dark. It made him weak for uncertain amount of time. That's could proove to be difficult for Flowey. But he had too for everyone is counting on him. 

Chara prepared her attack. She summoned an enormously huge ball of black color. Otherwise known as Ball of Hate. Omega Flowey saw her attack and he had to decided on how to counter it. He then used souls power by opening his mouth, which he charged all six souls and power he had for white beam. It had enough power to completely destroy Chara's move. However it did not kill her, she escaped via teleportation. She stood before powerless Flowey, who used all of power that souls and he had to stop Chara. Now he had not chance on stopping her. When hope seemed lost. Frisk wanted to still move on. She moved to Flowey protecting him with her own unique shield. That did the deed. Chara's killer move did not reach Flowey. Frisk called for help. Her soul and others combined to created someone of godly power. Asriel Dreemuur the Best Friend.