Just a cool secret

There is an attack in the Jackenstein fight (i believe after the YOUR LONG attack) wich has 6 symbols hidden in the darkness. the symbols are:

1. A crown 2. A flower 3. A katana/sword

2. A knight (chess piece) 5. A queen (chess piece) (i think it is a queen) 6. A king (chess piece) (i think it is a king)

This is mostly for the theorists here!