In the lore of the Hermetic Order of the Golden Dawn, Mons Abiegnus (Latin, 'fir covered mountain') was a mythical mountain that symbolized the spiritual journey of the initiate. Borrowed from Rosicrucian symbolism, Abiegnus is visualized as the kabbalistic tree of life in the form of a subteranean mountain, with the legendary tomb of Christian Rosencreutz (symbolic of the Hermetic/Alchemical initiation) contained within.

Abiegnus

The tomb of Christian Rosencreutz

Related resources:

• Golden Dawn Resources
  A collection of historical images depicting the black mass.
• The Rosicrucians
  Demonology, both ancient and modern, including the Goetia and other Demon-centered works, the legends of Solomon, fallen angels, and more.
• John Dee
  Historical Resources, Images, et al.
• Magick and Theory
  Magick and magickal theory. What Ritual magicians do, and why they do it. Essays on a number of subjects relating to Ritual/ Ceremonial Magick.