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If your "higher beings" are something that you can talk with, you could form contracts with the beings in exchange for power. Great power needs often a great price. The higher the being is, the mor...
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If your "higher beings" are something that you can talk with, you could form contracts with the beings in exchange for power. Great power needs often a great price. The higher the being is, the more it takes from the contractor. That is the first example that popped in my mind, but there are many others. The best way to figure something out for yourself would be to research the pre-christian magic. Ancient Magic from Egypt or Babylonia. Old Irish and Scottish Magic. Persian Magic, something like that. There are often magics, related to some god, Dschinn or Spirit that could help you with the building of this system.