Draconian Shroud

Beseeching draconic forces for protection, you create a shimmering, transparent visage of a dragon that overlays your own form. You and any creatures of your choice within 30 feet gain a +1 bonus to AC and either resistance to bludgeoning, piercing, and slashing damage from nonmagical sources OR immunity to one of fire, cold, acid, lightning, or poison damage (you make the choice when you cast the spell), as well as immunity to the frightened and charmed conditions. Additionally, when a creature benefiting from this protection fails a saving throw, you can use your reaction to allow them to re-roll the save. This benefit can only be used up to three times in total for the duration of this spell.