Kapitel 859: UNITE, FIGHT (2)

That is not to mention the others who also uses considerable amount of the energy of the world to raise their levels. 

And it drained the world energy quickly and in a fast rate so much so that the rate of the energy being taken is surpassing the rate of the energy being replenished.

When Azief left the world, the world is slowly showing signs of having energy depletion. They know that the energy would be replenished but it would be slow. 

And the more they take, the longer it would take for it to be replenished.

As such, there is even people who went outside of Earth to cultivate and absorb the energy from other worlds.

And such, this created the current problem of the weak and the strong. And the system is no longer fair

The weak people consisted mostly of those who were kids or old people when the Fall happens.