Disjunct Magic

Choose a creature you can see within 150 feet of you. For this spell's duration, any time that creature attempts to cast a spell or use a charge of a magic item, they must make a Charisma saving throw. On a failed save, the spell or charge consuming effect fails, but the spell slot or charge/s used are still expended, and the target suffers 1d10 + double the spell level of the failed spell as force damage from the magical energy violently breaking down. Cantrips are considered level 0 spells for the sake of this function. Charge effects which are not spells treat their effective spell level as the rarity of the item plus the number of charges used for the effect, where common items are considered a value of 0 and each rarity level above common increases this value by 1 to a maximum of 5 for artifact rarity items.

A creature that moves more than 150 feet from you is no longer affected by this spell, but you may maintain concentration on this spell and retain them as your target, the effect resuming upon coming back within 150 feet of the creature. You do not need to maintain line of sight on a creature for the effect to function, so long as you could see them when you declared them your target. As a bonus action on each of your turns, you may transfer this effect to another creature you can see within 150 feet of you.

At Higher Levels. When this spell is cast using a spell slot of 5th or higher level, increase the damage inflicted by failed spells by 1d10 and the effective range of all effects of this spell by 30 feet for each spell level above 4th at which it is cast.