Qualified

The Qualified (資格者) were special individuals chosen by the Blue to stay in the world during the Day of Ruin.

Having a strong dream is a condition to be one of the Qualified. They could reconstruct the world with a fragment of the Blue. To obtain it, they had to defeat Hades: Izanami, but their desired worlds were denied by the superior Qualified, the wielder of the Master Unit.

The Qualified could use Magic Formulas even in the world without any magic element, and they could also detect other Qualified. Those with Drive were being slowly absorbed into the Boundary, which made them weaker.

In case of losing a desire, their rights, the one turns into the magic element. Es used to back up those who lost their rights and disappeared from the world.

Since Ragna the Bloodedge was not a Qualified, and he was born without a Drive, his capacity for magic element allowed him to remove the qualifications of others by consuming their desires using his Soul Eater, making them forget about their dreams.

After Ragna obtained the true Blue, he recreated the world from the consumed desires, and made them a possibility.