When you cast this spell, choose a school of magic. A 30-foot-radius invisible sphere surrounds you, dampening magic of the chosen school. When a creature in the spell’s area casts a spell of the chosen school, it must succeed on a Constitution saving throw against your spell save DC or the spell fails to cast, expending the action and the spell’s use or spell slot.   Active magical effects of the chosen school, such as the spell false life when dampening necromancy or the spell mage armor when dampening abjuration, are suppressed while within this spell’s area. While an effect is suppressed, it doesn’t function, but the time it spends suppressed counts against its duration.   This spell has no affect on spells cast outside the spell’s area.