Finally got the beginnings of an original magic system working.
Customized two afx spells to become Call of Cthulhu and Eye of Ra, then linked them to the 3d tarot gui.
Figured out how to add an alpha channel to a png so as to make the background transparent. By placing a sigil on a transparent background and building a gui around it, I can approximate the effect of “drawIng” many different grams (pentagrams, heptagrams) of many different colors, which hover in front of the player in first person mode. Different grams can be brought up by pushing the many-colored gems at the points of a hexagram, which is itself transparent and centered in the middle of the screen, like a spellcasting/targeting HUD.
Screenshots and videos soon.
The aspect of designing a magic system (maybe of designing generally) that I like the best is interface design and special effects programming, when they are closely connected to gameplay.