Added basic setting/MAGIC.md

src/settings/MAGIC.md

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+### Using Magic
+
+To cast a magic spell, a creature must meet the following conditions:
+
+- Have an Intelligence level greater than or equal to the level of the spell being cast.
+- Meet a skill check using the spell level times 5 to determine the difficulty
+- Not have a fully opposing (10) affenty to that magic type.
+
+### Spells