Evil Pieces

The Evil Pieces (悪魔の駒（イーヴィル・ピース） Īviru Pīsu), also known as the Devil's Pieces, are a set of fifteen chess pieces given to top-class Devils to increase their ranks by reincarnating other beings into Devils.

Summary
The Evil Pieces are created by Ajuka Beelzebub to help replenish the number of Devils after the Great War the caused the death of many Devils. While many Devils are able to adapt to the Evil Pieces, only the Old Satan Faction of the Chaos Brigade resist using the Evil Pieces, believing them to be a disgrace to Devils for reincarnating Humans and other races into Devils. The creation of the Evil Pieces eventually lead to the creation of the Rating Game.

Abilities
Based on the game of chess, a total of fifteen pieces (1 Queen, 2 Knights, 2 Bishops, 2 Rooks and 8 Pawns) are given to Top-class Devils (King) with a peerage. These pieces are used to reincarnate other beings into Devils and become servants of the top-class Devil.

Pieces
Each piece has a corresponding value. These values are used to determine which piece may be used to reincarnate a someone, their strengths, talents or skills play a role in determining their value.

King
Top-class Devils with a peerage are given the King Piece.

Queen
Queens (女王 Kuīn) are worth 9 Pawns. The traits of Queens are having all the characteristics of Rooks, Knights, and Bishops.

Rooks
Rooks (戦車 Rūku) are worth 5 Pawns. The traits of Rooks are immense strength and defense.

Knights
Knights (騎士 Naito) are worth 3 Pawns. The traits of Knights are increased speed and mobility.

Bishops
Bishops (僧侶 Bishoppu) are worth 3 Pawns. The traits of Bishops are enhanced magical abilities.

Pawns
Pawns (兵士 Pōn) are worth 1 Pawn each. The traits of Pawns is the ability to promote into a Queen, Rook, Knight, or Bishop in enemy territory.

Mutation Pieces
There are also special pieces known as the Mutation Pieces (変異の駒（ミューテーション・ピース） Myūtēshon Pīsu). If reviving a person requires 8 Pawns, then using 1 Mutation Piece would suffice to revive that person instead of using 8 Pawn pieces. Mutation pieces can be a Queen, Rook, Knight, Bishop or Pawn. They are said to be very rare.

Unused Pieces
Another feature installed in the Evil Pieces are the Unused Evil Pieces, which will undergo changes according the master's growth, allowing the King to use less pieces when reincarnating humans into Devils.