If the spectres attacks can be blocked and easily redirected he is not omnipotent and therefore your argument is invalid. You say omniversal as if it means something when durability does not play a factor in dlanor's attacks. Stop spouting out your rear and pay attention. The potency of the attack does not matter because it cannot be blocked and does not attack on a physical level.
Actually there is no manga or comic character fully omnipotent. for example for that Dlanor girl i can create a character to be inmune to any type of attack ,including dlanor's attacks and it's the end of her.
You still refuse to show me Dlanor affecting beings in the real world. Mr Mxy can become the writer and completely DESTROY DLANOR! He can rewrite the Red Key ANYWAY HE CHOOSES TO JUST LIKE THE AUTHOR!
actually that's the only way Mr MX can win.
That or just change the author of the manga to himself! lol