Dragon Warrior

Dragon warriors are individuals similar to draconic blood sorcerers except they use their innate magic to enhance their martial prowess rather than cast spells. Whether your dad is a bard or you decided taking a bath in the giant pool of red liquid that just spilled out of a fire breathing lizard was a good idea you've got dragon powers now, and can do a number of things which run on a system similar to sorcery point. Some of my inspirations for this subclass were the dragon knights from elder scrolls online, the new DOTA animation on Netflix, and a few other minor sources that aren't worth mentioning. Anyways hope you enjoy my creation, and please leave a comment for further refinement if it is unbalanced for a potential version 2.

Draconic Fighting

Beginning when you choose this archetype at 3rd level you can choose to gain resistance to one damage type of your choice between acid, lightning, fire, cold, and poison damage this damage type also plays into the damage type of your abilities. Additionally, you get access to a number of draconic energy points equal to twice your proficiency bonus which recharge on a short rest. Saving throw DC for your draconic abilities equal 8 + proficiency bonus + strength or dexterity modifiers. These draconic energy points can be used for a number of things listed bellow with individual point costs. 

Dragon Breath: You can expel elemental breath like that of dragons. As a bonus action you can spend 1 draconic energy point to breath fourth the damage type you chose in either a 5x30ft line of a 15ft cone. Enemies hit must make a dexterity saving throw taking half damage on a success, and taking full damage on a failure. The damage of the breath equals 1d10+proficiency bonus, and increases to 2d10 at 5th level, 3d10 at 11th level, and 4d10 at 17th level.

Draconic Plating: You can cause your draconic energy to surge fourth increasing your resilience, and whatever you happen to be wearing. As a bonus action you can spend 2 draconic to increase your AC by 2, and gain half your level plus your constitution modifier rounded up in temporary hit points for a minute.

Elemental Weaponry: You gain the ability to infuse your attacks with your draconic energy allowing them to do elemental damage of the type you chose. As a bonus action you can spend 2 draconic energy points to add your proficiency bonus to the damage of your none spell attacks, and convert the damage of those attacks to the damage type you chose at 3rd level.

Draconic Influence

Starting at 7th level, you can gain expertise in the intimidation skill. Additionally, as a bonus action you can spend 3 draconic energy points to summon a fear aura causing all enemies that can see you within 60ft of you have to make a charisma saving throw. On a success the enemy is not inflicted with fear and cannot be effected by this ability for the next 24 hours, and on a failure the enemy is placed under the fear condition for one minute.

Additional Fighting Style

At 10th level, you can choose a second option from the Fighting Style class feature.

Archery

You gain a +2 bonus to attack rolls you make with ranged weapons.

Defense

While you are wearing armor, you gain a +1 bonus to AC.

Dueling

When you are wielding a melee weapon in one hand and no other weapons, you gain a +2 bonus to damage rolls with that weapon.

Great Weapon Fighting

When you roll a 1 or 2 on a damage die for an attack you make with a melee weapon that you are wielding with two hands, you can reroll the die and must use the new roll, even if the new roll is a 1 or a 2. The weapon must have the two-handed or versatile property for you to gain this benefit.

Protection

When a creature you can see attacks a target other than you that is within 5 feet of you, you can use your reaction to impose disadvantage on the attack roll. You must be wielding a shield.

Two-Weapon Fighting

When you engage in two-weapon fighting, you can add your ability modifier to the damage of the second attack.

Draconic Enhancement

Starting at 15th level, you can spend your draconic energy to enhance your draconic abilities even further providing additional benefits.

Enhanced Dragon Plating: When you use your Draconic plating ability you can gain resistance to non-magical bludgeoning, piercing, and slashing damage at the cost of 2 additional draconic energy points. The number of temporary hit points you gain is doubled as well.

Enhanced Elemental Weapon: When you have your elemental weapon active you can spend an additional 2 draconic energy points to ignore the resistances of enemies you hit with your elemental weapon. Enemies with immunity also take half damage from your draconic abilities.

Enhanced Dragon Breath: When you use your dragon breath you can spend 2 additional draconic energy points to double the damage dice of the breath weapon.

Dragon Form

At 18th level, you can spend all of your draconic energy in one go to transform yourself into a draconic being. At the start of your turn you can spend all of your remaining draconic energy point, and doing so automatically activates all your draconic abilities enhanced versions and your draconic breath becomes free to use. In addition while in this form you also gain a flying and swimming speed equal to your walking speed, you gain a true sight out to 60ft, and you become immune to the element you chose at 3rd level. This form lasts for one minute and upon exiting this form you fall unconscious, and gain 4 levels of exhaustion till you regain all your draconic energy points.