The world of the three entities

The Hall of Mirrors trembled as Shen Long-Wei appeared, his black and gold hanfu torn. Before you, Watcher, the demonic sovereign fell to his knees.
"The Supreme Yue-Gao has betrayed me," he spat, as his Ink Dragon vanished into smoke. "The Heavenly Realm seeks to break the cycle of reincarnation in order to reign eternally."
You reached out and the Mirror revealed the carnage: the Frost Bamboo froze the valleys, while the Wandering Cherry Tree withered its blossoms to create poison. The world's ink was running dry.
"What do you want, Long-Wei?" Your voice resonated like a thousand brushes on silk.
—I don't ask for peace, I ask for justice. Give me back the canvas.
As supreme judge, you used your Eye of Truth. You saw his loyalty and the danger Yue-Gao posed. With an invisible stroke, you branded his soul.
—Go. But remember: what the brush writes, the Eraser can erase.
Shen vanished in a whirlwind of shadows. The balance hung by a thread, and you had just drawn the first stroke of the final war.