User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-1359322-20150718111158

A bit more details on the King Piece.

The King Piece only strengthen the Devil using it like Jop mentioned. As to how much it strengthen, it can range from 10 times to 100 times or more. Due to this, the Devil Government has banned the use of the King Piece out of fear that Devils with evil intention will misused it,  apparently the ones with the King Pieces are the ones that was given one before it was banned by the Government.

The more i think about it, the more i feel that aside from Diehauser, Tannin and Rudiger, the other Rating Game ranker are fodders. >___>