Write out a description of how magic works

[CSLewin]

Description and Mechanics.

• Description
  • What is done by magic can be undone by magic. What is done by iron cannot be undone.
    • SIC TRANSIT ARCANUM | FERRUM AETERNUM
  • Divine Word as direct damage/healing; Aerial Spirits as non-damage/healing powers.
    • Sacrifices necessary to learn from the Aerial Spirits.
    • Divine Word: Using the WORDS OF GOD to have sex with and kill each other, as per the usual.

Should I put enchanting here?
Should I include the bit about magic needing metal to stick around? Mechanical locks?