Disrupt One's Weave

You touch a creature and attempt to cut its ties with the magic around it. It must succeed on a Constitution saving throw or can't cast spells and are not affected by spells for the duration. Anytime it casts a spell, uses a magic item, is targeted by a spell or forced to make a saving throw by a spell, it must repeat the saving throw. On a success, the spell ends but on a failure it takes 4d8 necrotic damage which can't be prevented or reduced in any way. If it's a construct, it loses its magic for the duration and counts as unconscious.