Draconic Ascension

Your innate draconic blood has granted you immense power, and upon casting this spell you realize the full potential your ancestry posesses. You transform into a creature of the Dragon type. The transformation lasts for the duration, or until you drops to 0 hit points or die. If you concentrate on this spell for the full duration, the spell lasts until it is dispelled.

The new form can be any Dragon you choose whose challenge rating is equal to the casters level, and is of the same type as the caster of this spell. For example, a Silver dragon blooded sorcerer could only turn into dragons of the Silver type. The caster's game statistics, including mental ability scores, are replaced by the statistics of the new form. The caster retains their alignment and personality, save proficiencies, as well as the ability to utilize any cantrips it may have in its normal form. Any damage cantrips must be of the same element as the Dragon form assumed. It does not gain any legendary actions or lair actions, as well as the change shape feature granted by any Dragon form they take.  

The caster assumes the hit points of its new form, and when it reverts to its normal form, the caster returns to the number of hit points it had before it transformed. If they reverts as a result of dropping to 0 hit points, any excess damage carries over to their normal form. As long as the excess damage doesn't reduce the creature's normal form to 0 hit points, they are't knocked unconscious.

The caster is limited in the actions it can perform by the nature of its new form, and it can't speak, cast spells, or take any other action that requires hands or speech, unless its new form is capable of such actions.

The caster's gear melds into the new form, or shifts to the new form. The caster can't activate, use, wield, or otherwise benefit from any of their equipment, unless the new form is able to use such items. 

Once the spell becomes permanent they can, as an action, willingly take on their humanoid form, retaining the Dragon form's hit points, legendary resistances, Intelligence, Wisdom, and Charisma scores, and senses. Its statistics and capabilities are otherwise replaced by those of the new form, except any class features of that form. This does not restore any features of the base form, just allows the caster to resume humanoid form to disguise their draconic body. This effect can be reverted as another action.