Dragon's Bane

As a bonus action, You may enchant your weapon and two additional allies within 20 feet. When you would strike a dragon, kobold, drake, wyvern or other draconic creature, that creature takes an additional 2d10 of the weapon's type, and then must make a Dexterity saving throw, Should it fail, it becomes surrounded in magical chains and is unable to fly for a minute. It can at the end of each of its turns, attempt to break free and reattempt the save. Dragons CANNOT use legendary resistance against this save.