The end of the Dharma era.
Technology is developing rapidly and faith is lacking.
People do not believe in the gods and Buddhas in myths, and instead believe in science and technology. This leads to the weakening of the way of heaven and the prosperity of the way of humanity. Under the suppression of the way of humanity, the gods and Buddhas in the sky cannot appear in the world.
In order to restart faith and for the immortals and gods to reappear in the world, the gods and Buddhas came down to inherit their respective traditions.
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