Elder Rune of the Mad Mage

(two additional options for the spell Symbol)
•Bane Effect: The target must make a CON saving throw (DC 22), taking 20d6 force damage on a failed save, or half as much damage on a success.
•Boon Effect: The target recovers its expended spell slots of 6th level and lower. If the target has no spell slots to recover, a magical shield surrounds the target for 1 hour instead. This shield grants the target resistance to all damage and can't be dispelled, though contact with an anti-magic fie