User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-16281343-20150718042050

The King piece does nothing special. It only strengthens the person that uses it. But the problem is its strength enhancement is comparable to Ophis' snake.

Most of the top rankers uses this King piece. Only a few have reached the top without using it including Tannin, Rudiger Rosenkreutz, and the Champion Diehauser himself.