This universe has a civilization of humans! And some other things. It's not crowded in the way Edda is but it's not just the one planet either. The humans might be easiest to start with. They're on that planet over there, it's not Earth but it has very Earthlike conditions and bronze-age humans living in cities and villages dotted across two large continents. Depending on how thoroughly any prospective visitors look they might find other things before visiting.
"Thank you. I have more, we'll look at each element. Just to be complete, the most basic earth magic is being physically tougher, and it can become always-on too. Most earth magic metaphor is defensive, resisting poison or heat or disease. The ultimate expression of earth magic is active healing of others, but the multiverse has more efficient sources of that, which feels a tiny bit tragic to me. Just a tiny bit, it's obviously good to have healing even if it takes away a bit of majesty from my favorite thing."
"I believe you will develop the thing we call a soul during our practice. I think a Spirit-soul is crucial for learning shamanism. It feels like... Well, not indescribable, I'm going to describe it. A bone-deep feeling that you need to stop. Something you should remember but just cannot, or trying to do athletics but your body is moving too slowly. I've heard others say 'like pouring from a cup that is empty', or 'like trying to breathe nothing', or 'the chill of midnight in winter'."
He has everyone sit in a circle in the clear area and walks around them. He reads poetry in a low steady voice and pauses to play a bit of music or nature sounds instead sometimes and tells them to feel the strength of the earth and the playful wind and the flow of energy in the plants and so on.
Nothing obviously magical happens.
He tells them they can continue thinking about the elements and meditating but trying to force it won't work, and he has copies of the soundtrack and poetry online, and he repeats the whole process with several more groups of eight.
The same class meets again two days later, and this time he's drawn circular diagrams in salt and chalk and ash.
"Welcome back! Today I'd like to discuss the basics of symbology and ritual in shamanism and then we can try meditating within a circle, which should help. First thing's first though, any questions?"
"These circles are meant to concentrate or block particular elements. They're the most common way to contain or repel spirits, and it'll be easier to feel the elements inside, or the differences as you cross. The next two steps if this doesn't work are visiting natural places with good resonance and visiting an actual aware spirit, but this is more convenient. The materials do matter, much like love has become resonant with the spirits and elements, certain materials and actions and symbols are too. Ash is fire, salt is neutral, seeds and flower petals and spices can be air or water, powdered stones and coal are earth. Chalk is earth, but only slightly."
"These circles are all perfectly safe. They're small and I drew them in a few minutes each and didn't pour extra ceremony or energy into them. Not all shamanism is safe, mind, but it's advanced works or hostile spirits that are truly dangerous. Salt is good for when you want all the elements or none of them, or just the effect of the symbols."