Slot Storer

You have lived your whole life attempting to fight or control magic and have now gained the ability to attune to it. When a spell targets you, you can use a reaction to make a constitution saving throw DC 8 + spell attack modifier + spell level. If you fail the spell’s effects continue as they would have, however if you succeed then you can store the spell slot and use an action to either a cast a spell of that level using said spell slot or imbue an ally so they can cast the spell.