Dragons are legendary creatures with raw innate magical prowess and physical might. To understand power, they must simply understand themselves. 

You can relate. 

You gain basic, yet powerful spellcasting and develop an aura that pushes your ki past your limits. Finally, you can simply transform into a dragon of you choosing.

Spellcasting

You gain spells and spell slots as a half-caster (identical to an Arcane Trickster). Your modifier for your spells is Wisdom, and your spell list is the sorcerer spell list. You do not need an arcane focus or material components as your spells are a part of your martial arts practice.  

Dragon Style

You may do slashing or piercing damage with your unarmed strike.

Additionally, whenever you cast a cantrip, you may make an unarmed strike as a bonus action. 

Dragon Soul

Choose one feat from this list (if you have access to it on DnD beyond) and gain the benefits even if you do not meet the pre-requisites:

Elemental Affinity,
Gift of the Metallic Dragon
Gift of the Chromatic Dragon
Gift of the Gem Dragon
Dragon Hide
Dragon Fear

In addition, you gain a breath weapon. When you gain this ability, choose one elemental energy type (Fire, Thunder, Cold, Lightning, Acid, Poison) and choose either a 15ft. cone or a 30ft. by 5ft. line. Once you make these choices, they cannot be changed. The damage of your breath weapon is equal to your unarmed strike damage. 

As an action you may make a breath weapon using the specifics you chose. Targets must make a Dexterity save against your Spell Save DC, taking half damage on a success. After you use this action, you may make an unarmed strike as a bonus action. This ability counts as a spell. 

 

Dragon Aura

You gain an aura of pure energy shaped like a dragon. You gain two benefits. You gain a flying speed equal to your movement speed whenever use your step of the wind class feature; as a reaction when you take damage, you may roll your unarmed attack die and reduce the damage you take by that amount as you create a shield from your aura's scales.

Dragon Shape

You gain the True Polymorph spell usable once per day. You may only cast it on yourself, and you may only turn into a dragon that uses the same energy type as your breath weapon.