It is arguably more structured and "practical" than the Shams al-Ma'arif , making it a manual rather than just a collection of lore.
You can search for and download a PDF version of "Manba Ushul al-Hikmah" from various online repositories, such as: manba ushul al hikmah pdf
A famous story circulates in Moroccan and Egyptian occult circles: A student found a Manba Ushul al-Hikmah PDF and attempted to construct a "5x5 Square of Saturn" without performing the required 40-day retreat (Khalwa). He reportedly drew the square in red ink at the wrong hour. The story concludes that he was found paralyzed on his left side and had lost his ability to speak Arabic—the language of the spells. It is arguably more structured and "practical" than
Because this is a centuries-old historical text, the original work is in the public domain. You can often find free, digitized scans of the book uploaded by libraries and academic archives on platforms like (archive.org) or specialized Islamic history digital libraries. The story concludes that he was found paralyzed
It is a manual for becoming a Muhaddath —one spoken to by the Unseen. The rituals require you to isolate yourself for 40 days in a lightless room ( Khalwa ), to change your diet to raw foods, and to recite the Basmala 125,000 times. If you do not emerge with bleeding eyes and a cracked voice, you did not do it right.
While mainstream Islamic scholars often viewed his works with suspicion due to their magical nature, al-Buni viewed his practices as purely divine sciences. He believed that manipulating letters and numbers was a way to interact with the fabric of creation [1].
Here's a review of the book: