Okay! This may be long so....

In Glitchtale Frisk and Chara fought Betty and lost as they were fatally injured by Betty. But Chara and Frisk managed to destory Kumu which caused Betty to die as well. Error sans discovered the au and started erasing the timeline as it was falling apart. Hate came along during the last second and fused them all together. Corruption was born. Corruption managed to escape the falling au just as it was destroyed. Causing them to be a glitch. Now Corruption wanders around Au's to Au's... To be continued...