User blog comment:B214/LN spoilers/@comment-139.195.58.103-20160426083301

You should add these info which were not mentioned in the Vol 10 summary links.

Majin (Desperado) are Blazers that can increase their magic power even though it's supposed to remain the same since birth. Strong desire to surpass one's inborn limits is an important factor in allowing one to become a Majin. After that, even magical power becomes like a physical muscle, and will improve by training. But it is not something that can be sought intentionally - it must be a natural thing, or you're dead. This is why the existence of this process is a closely-guarded secret.

There are 3 major world organizations and each has a very powerful Majin. The League of Mage-Knight Nations has Arthur Bright, head of the League HQ, nicknamed "Whitebeard" and KOK 1st world ranking. The Union has Abraham Carter, head of US supernatural power unit, nicknamed "Superman". Rebellion has a mysterious ruler called the "Tyrant". The Tyrant will die soon of age and so a war between the League and the Union will occur in the future leading to Japan's destruction as shown by Tsukikage's device. Only Majin can defy fate and change this outcome.