User blog comment:B214/Question and Answers 6/@comment-94.5.128.78-20160622184028/@comment-24.113.252.213-20160622201027

Originally, Pure-Blooded Devils would be given a King Piece to establish their role as the master of their peerage. But they found that the King Piece was to dangerous and banned its use (thought the Higher-Ups of the Devils Society secretly used it to maintain controle). Instead of the King Piece, there is a monument in the Satan Territory that the new "Kings" touch in order to register as the master when they get their Evil Pieces.

This way, Devils who are part of a peerage (and therefore have an Evil Piece within them) can safely become "Kings" of their own peerage when they get their own Evil Pieces.

So yes. Even Pure-Blooded Devils have Evil Pieces implanted into them when they join a peerage.

Sorry for the long explaination. I have a habit of explaining the origins of a topic I'm interested in.