Hexagram...

The sixty-four hexagrams were known as "Yi" in the previous life, expounding the ultimate principles of heaven and earth. They encompass everything and in this world, they possess the supreme Divine Ability.

They are even related to the origin of the world.

Su He has the hexagram of constancy, but he can't understand it at all. His knowledge is too scarce, and the Dragon Turtle still needs to work hard.