Introduction to Eight Bodhisattvas in seven buddha is about Darani.

The Eight Bodhisattvas in seven buddha said that the Great Darani Mantra has four volumes. The lost translation. It is one of the secret classics of Tantric Buddhism. It is also the mantra sutra of seven buddha, the mantra sutra of Eight Bodhisattvas in seven buddha, the mantra sutra of Dalani in seven buddha, and the mantra sutra of seven buddha, which benefits all beings. In the twenty-first volume of Dazhengcang. This scripture can be regarded as the source of pure esoteric biography in later generations.