Hi there, each chess piece has a random attribute placed on it. two of the same level chess pieces can be fused together and upgraded into a higher level chess piece. The upgraded chess piece’s attribute depends on the fusing chess pieces; if they are the same, the upgraded chess piece will be guaranteed to have the same attribute. If the fusing chess piece has different attributes, it will be randomized among the two attributes. Each chess piece attribute will be bound onto a specific goddess, you can simply fuse them together by dragging one of the chess pieces to the other one.