Gaster had a lot of problems growing up he fought in the monster army and he still had a lot of PTSD from the war with humans. So when he had his sons sans and papyrus in order to keep himself from lashing out at them. He decided to get therapy his therapist had advised him on taking out his anger on a punching bag. It actually helped a lot and was very therapeutic gaster actually really got into boxing. He found it enjoyable. One day Sans caught him Practicing he had papyrus with him at the time. And was scared that their father was going to lash out at them so in order to keep that from happening he pushed him into the core where he was pulled into the void gaster saw his own son push him. He'd actually become terrified of his son rightfully so Classic had hidden what had happened to his father. Never telling anyone especially when he found out the truth about his father the therapy he was going through. He didn't want anybody calling him a villain. In the void gaster had changed he was shy and skittish and so frightened and he was touch starved. He had trouble sleeping there were noticeable bags under his sockets he cried a lot he felt a gentle presence pick him up. Next thing he knew he was in a endless white void this was no different to his void he curled up and cried that's when he heard a glitchy voice" What are you doing in my anti void?" "I'm sorry I didn't mean to be here. Please don't hurt me, I don't want to be hurt again." There was a pause. "What do you mean again?" The glitchy voice questioned. "I have a lot of PTSD problems from the war and I got into boxing to help me cope.  Then my son saw me boxing.  He considered me a threat, and he purposely pushed me into the core. He covered up my death to make sure nobody knew what actually happened. I saw from the void as he told other versions of himself that I fell in that there was an accident. There was no accident. Classic purposely pushed me in." Error was stunned.  After all, the crap classic had given him for being the forced God of destruction, classic had purposely pushed his own dad into the void. And covered it up, not even his own brother knew what he did to their father. Error despite what everyone said about him as the God of destruction. He was not unnecessarily cruel he wouldn't kick out gaster not like this. Gaster deserved better then a son who would betray him and then cover it up. And it would be nice to have some company around, though you'd never hear him admit to it. Error sat down in his bean bag chair and proceeded to start to knit, leaving gaster to peacefully get some much needed sleep after all the stress.