To most effectively contain a demon, a summoning circle is drawn along equipotential lines. These are specific to each demon - if you know the demonic field equations, you can reconstruct a circle from a sigil and vice versa.
- Spells are a spoken (sometimes written) programming language that you have to know quantum mechanics to use
- Spells cost and direct energy, which can be stored up in objects
- Mages have a 'magical name' that they have to speak as part of a spell, sort of like an API token