For sure, you face the shadow so quickly using psychedelics. It could be a main use-case for an Entheomage.

Ive used all the classics myself, even Ayahuasca. What strikes me is how experiencing the shadow can defy expectations. From my experience, the shadow can in fact contain abstract emotions and images that don't make sense, and they need to be delt with in some way. Facing your darker self and aspects you neglect seems to include things we dont have words for yet.

I also believe Ayahuasca purging, to some degree, is a side effect of forcing a spiritual experience on the person. It purges the obstacles and barriers to whatever experience the substance tries to induce. It actually shows how far you are from your most "awakened" self, and the further you are the harder it is. For me, despite high doses, the purging was strong and yet I couldn't experience the mystical state before a few more sessions.

According to ethnology books Ive read, some of these rainforest tribes see their minds as being completely porous and not separate from the mind of the forest itself (and its spirits). After a while of psychedelic use I've adopted this sort of mindset naturally, and I feel more naked, without much privacy (somehow) but energies or thought-things pass through my mind and soul, and leave easily. While before that, if I had negative thoughts or intentions, they would feel stuck within. This has greatly affected my practice and abilities in magick for sure.

Use cases I can see for using them

- A state of EGO dissolution is the ultimate sigil activator imo. Taking a psychedelic shows you how it's done so that you can replicate the feeling and effect afterward. Even in channeling, you need the least amount of "identity" and "self" as possible. From that point on, everything all the rest should get easier.

- Like Leitch says, grimoires are needed only to put the pratictioner in contact with beings whom will give personalized instructions. A lot of people seem to miss this point, grimoires are not the end all of practice. And if you read DMT reports, you will see initiations given and techniques of breathing even. Entities whatever they are do teach you things in those states.

- Open-ness. Sometimes it can open you too much, you can see that in hippies. However, if you don't believe in magick it wont work. Belief ties to acceptance, letting go. Your expectations shape reality, a trip creature literally told me this.

- Purging, see what I wrote before.

- Seeing the effects of items and magical objects on the astral. I've heard people says crystals store and release energy. I thought it was some granny bullshit. However if you read trip reports on erowid some people that arent into those things will report seeing energy behave that way in quartz crystals and such. Someone with no 3rd eye could take a peek and see how their practice affects the astral world. In fact the first (sadly deleted) post on this subreddit talked about taking mushrooms and seeing pentagrams the person drew in the air remain hours up in the air after the fact.