Divine Grass Elixir - Calamus Pill 神仙服食灵草葛蒲丸方

The compiler is unknown.

Since the book mentions the "fourteenth year of the Dali reign" (779 AD), it was presumably compiled during the Tang Dynasty. Consisting of one volume, it is included in the Methods category of the Dongshen Section in The Daozang.

Divine Grass Elixir - Calamus Pill

This text refers to Acorus tatarinowii as the "spirit of water" and a "spiritual herb of immortals," noting that hermits in mountains and forests all ingest it. It lists several methods for collecting and preparing Acorus pills, and elaborates on the efficacy of taking them. It claims that ingesting the pills can aid digestion, cure diseases, restore youthfulness, make the skin smooth and delicate, and give the complexion a radiant, peach-blossom glow—ultimately leading to longevity, transcending the mortal world, and becoming an eternal True Person. The book also cites the names of immortals throughout history who attained enlightenment and ascended by ingesting Acorus as evidence.

At the end of the text, it is falsely attributed to an immortal: "The 'Treatise on Acorus' consists of twelve volumes, kept secret among the upper officials. It is fully recorded in the Shangqing Scriptures; I have briefly compiled the key sections to present to those who study the Dao." This indicates that the book was likely written by a Taoist Priest of the Shangqing School during the Tang Dynasty, reflecting the school’s unique understanding of spiritual herbs in Taoism.