Crystal is divided into crystal matrix and crystal tank.
The top five chariots will automatically join the crystal matrix.
The chariot can be put into a crystal tank, and chariots put into crystal tanks use temporary ranks while retaining real tanks. Chariot Temporary Rank = Crystal Rank = Rank of the lowest rank Chariot in the Crystal Matrix, still limited by its own highest rank.
Crystal rank will limit the player's chariot rank. For example, crystal ranks 60 and hero ranks 80.