The Azure Soul Caster summary:

The Four Deities – Qing Long, Zhu Que, Bai Hu, and Xuan Wu – were once the guardians of the world. One day, they were all corrupted by an unknown power, altering their minds and making them begin to destroy the world they had sworn to protect. The sole descendant of Qing Long, named Luo Zi, has decided to search for the source of this unknown power to undo its corruption and restore the Four Deities to their original state.