1. It took a cosmic cube to put him down the first time
2. Even in a KO'd state.. that is the only way 3 of the most powerful telepaths in marvel could control his mind
3. Killed billions of the Universal Church of Truth
4. He one shot KILLED Phyla with ease
5. He one shot KILLED drax with ease, in a weakened state
6. Even while weakened those same 3 telepaths could no longer faze his mind.. he had to be KO'd for them to even have an effect
7. He punked Mar-veil and even called him a flee.. The same Mar-veil that was punking high heralds like they were nothing. The same Mar-veil who one shot killed The Magus.