Sauron!
Even though Sauron had most likely died, no one had questioned his first ranking for so long after his death.
Every time a level 10 alien wanted to challenge Sauron's authority and call himself the number one expert in the plane,
The Fire Sovereign would find him and beat him up.
"You can't even defeat me, the eternal second place. Are you worthy of the title of first place?"
The most ridiculous thing was that Levi learned about it from the Flower Knight.
According to the observations of the congress' Eye of Sauron, the number one expert on the plane was watching the battle outside the Dark Ancient Tower.
He couldn't help but sigh in his heart. The longevity species were really good.
While he was cultivating tirelessly all day, others were sleeping and watching the show. They were born at the level 10 endpoint that most wizards could not reach.