Arcane Fury

One creature you touch becomes filled with raw arcane energy. The target gains 50 Temporary Hit Points. The spell ends if they no longer have any hit points left. The target gains Immunity to Force damage, and whenever they would take Force damage, they instead regain a number of Hit Points equal to the amount of Force damage they would have taken. The target gains Advantage on all attack rolls and saving throws, and when they deal damage, they can choose to deal an extra 3d8 Force damage. As a Magic action, the target can choose to end the spell on themselves. When the spell ends, each creature in a 10-foot Sphere centered on them (including them) makes a Constitution saving throw, taking 12d10 Force damage on a failed save, or half as much on a success.