“The Fifty-eighth Spirit is Amy, or Avnas. He is a Great President, and appeareth at first in the Form of a Flaming Fire; but after a while he putteth on the Shape of a Man. His office is to make one Wonderful Knowing in Astrology and all the Liberal Sciences. He giveth Good Familiars, and can bewray Treasure that is kept by Spirits. He governeth 36 Legions of Spirits, and his Seal is this, etc.”
Let me break down the liberal Sciences part because it’s one of the most common phrases in the demon descriptions.
In modern terms, this means things like history, philosophy, art, and social sciences. During the period in history that these grimoires were actually written, it was a more general term including the study of languages, math, and astrology.
Given that the description outright says astrology, what does this mean? Astrology is the art of making predictions about the universe. This means that Amy in particular can train you essentially any for of divination. Tarot, runes, I-ching, pendulums, whatever form. It doesn’t matter. But she can also instruct you on how to create things that harness the energy of the stars, i.e, tailsmens. Once you know how to do that you can pretty much manipulate any conceivable situation to your advantage through the power of correct timing.
By extension, working with Amy is going to enhance your spiritual perception(which I’m going to refer to as the throat chakra and third eye just to pull from a system most are familiar with). In fact, Amy knows how energy bodies work and can help you to remove blockages which would normally prevent you from learning what she has to teach you effectively. Outside of magic, this could easily be applied to understanding the intentions of others and being able to more freely express yourself.
The last part, the treasures kept by spirits, relates to the treasure of knowledge. Meaning that if a lesser spirit is being deceitful, she can help you compel them to give you the information you’re looking for. Additionally, if you work outside of demonolatry and want to invoke beings of other pantheons using the sigil method, Amy is who would use to channel said sigil as well as creating the invocation chant.
Overall, She seems like more of a spirit you’d work with if you want to enhance your occult skills. At least, that’s the extent to which I’ve worked with her. I might need to revisit this spirit later on.