Lans and the Heroic Squad, indeed, they're young and powerful, but it doesn't mean that all twenty-five-year-olds are level five warriors or level five mages.
Lans and his team are just a small representation of those with exceptional talent, while many of their peers are still struggling at levels two or three.
The formation of the dungeon does not make everyone become easier to cultivate, it only targets newborns, making it easier for them to level up.
Among these children, there are differences too. Only a small part of them can become level five warriors or legendary warriors, most of them can only stay at levels three or four.
This small portion of children is key to the destruction of the world.
"It's not necessarily about conquering all the dungeons. Maybe when four out of five dungeons have been conquered, the appearance of a ten-year-old at the Divinity Transformation Stage will be enough to destroy the world."