Shape of the Dragon

You've discovered how to transform yourself into a dragon. Once per day, you can cast 7th-rank Dragon Form as an innate arcane spell, transforming into your chosen type of dragon. The spell automatically heightens to 8th level if you're 16th level and 9th rank if you're 18th level.

Any time you score a critical hit with an unarmed Strike gained from dragon form , you recharge the spell's breath weapon immediately.