What about the blood saint?

There are two ways to exchange four-star cards, one is diamond calling (again ...), and the other is crystal exchange in the divination room, but you have to open the picture book to be eligible for exchange. In the future, debris exchange may be opened, and you can also play shelters. The probability of explosion is very small. Really, I maxed out a 3-star card.

I hope I can help you, hee hee O(∩_∩)O~~~