User blog comment:HozzieHozzbourne/Strongest champion outside of the game/@comment-4652200-20130919222418

Xerath is powerful indeed but if we assume magic is a form of energy, that means he isn't truly indestructible, for example if Veigar can summon/make a real black hole he can be trapped there "forever", or Malzahar can summon another creature from the Void that is made of pure magic and it can destroy Xerath...