In the beginning, Edgyhead was in the same place Lil' Eggy was when he was just a kid. But he never saw Collector, or the motivation to help others. As he grew older, he realized something.
That the whole "Good VS Evil" fighting "To save the Multiverse" was just an endless charade.
The good guys would eventually win, but the bad guys would always return even stronger, and this happened endlessly. There was no happy ending. There was no purpose. It was obvious that neither side would give up, so he only had one option.
To kill them ALL.
He used his divine powers and twisted them into a tool of destruction, and one by one, he started killing the most powerful beings in the Multiverse. After he had finally exterminated every being of extreme power in the Multiverse, and collecting one fourth of the Reality Ruby, he had a revelation. There were other dimensions, dimensions that would also suffer through this same endless cycle. So using his extreme power combined with the fourth of the Ruby, he built the Reality Palace. This dimension would be his place his headquarters, and where him, his wife, (and his thousands of cats) would live.
He traveled from multiverse to multiverse, killing all the ultra-powerful beings, and recruiting new members to his cause along the way. Eventually, while experiencing a vision through the Ruby, he became aware. Aware of the other planes of existence, the ones with the puppet masters. The people who were controlling everything and everyone. Him, and everyone he knew, there existence was all just a game, and this only drove him further, to destroy every single being who contributed to the pointless fighting...
And that was how Edgyhead became the powerful and destructive mastermind that he is today. Thank you for your time.