Draconic Ascension

You transform into a formidable GreatWyrm dragon of your choice (such as red, blue, black, etc.). Your statistics and abilities are replaced by those of the chosen dragon, including hit points, ability scores, speed, natural armor, saves, condition immunities, senses, skills and attacks. You retain only your alignment, personality, and memories. When you revert to your normal form, you return to the number of hit points you had before you transformed. If you revert as a result of dropping to 0 hit points, any excess damage carries over to your normal form. As long as the excess damage doesn’t reduce your normal form to 0 hit points, you aren’t knocked unconscious. Your gear melds into the new form. In addition you can benefit from any class features you have including spellcasting but in limited compacity. While in this form, you can only cast spells with the dragon descriptor. Your attacks use your spell attack bonus, and the breath weapon's saving throw DC is your spell save DC.

Unique Breath Weapon: During your transformation, you can use your action to unleash a devastating breath weapon this breath weapon is unique from the normal Greatwyrm Breath weapon. The breath weapon has a recharge time of 5-6 on a d6. The area of effect is typically a 300-foot cone, and creatures caught in the area must make a Dexterity saving throw (DC equal to your spell save DC) or take 26d12 force damage. A successful save halves the damage.