Code of Constraint

You enact a code of restriction in a 40 foot cube centered on a point you can see within range. Choose a school of magic. For the duration, creatures in the spell's area cannot cast spells from the chosen school of 3rd level or lower. When a creature starts their turn in the area or enters it for the first time on their turn, they may make a Wisdom saving throw. On a success, they can cast spells as normal until the start of their next turn. If you maintain your concentration on this spell for its whole duration, the effect becomes permanent. At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, creatures cannot cast spells from the chosen school if their level is less than or equal to the level of the spell slot you used.