User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-75.71.34.254-20150326233658/@comment-16281343-20150327004936

That's not it.

After Ravel was hit by an attack by Belial and her immortality + the Rating Game system didn't work out, Belial explained what his family's ability is and that's to make theirs [worthless].

Then, Belial talked about how it was interesting that the Evil Pieces had 8 Pawns, 2 Knights, 2 Bishops, 2 Rooks, and 1 Queen. Parts of what he said was censored out as it was confidential.

He then took out an item that was also censored out. The scene implies the existence of a King Piece.

Belial then talked about how awesome Ajuka is for creating the Evil Pieces and only he knows the technology needed to manufacture those pieces out of the crystal inside Agreas. After that, he said that Cleria, his cousin, accidentally found out about Ajuka's base in the human world and something that she was able to do. Again, implying that Cleria's discovery has something to do with how Diehauser Belial had taken possession of the King piece.

TL;DR: What you said is wrong. Ravel's piece wasn't taken from her.