What is blood crystal and how to get it with crystal?

Blood crystal is a special function prop in blood game. It belongs to rare props.

How to get it: Players participate in various activities in the game every day and sell 3-star and above character cards.

The role of blood crystal: you can exchange the role card of the territory divination room with the crystal!

(Note: Crystal changing roles requires the player to unlock the characters in the character book, which is not required for special activities. )