The Lone Samurai

You stand alone as a killer with honor. Your lineage, stemming from both human and draconic, has influenced you throughout your life as you've tried to surpass your mortal limits and embody what it means to be a dragon. You've pushed yourself harder than most to reach the pinnacle. When others look to you, they don't just see someone who's good with a blade; they see their champion, their defender, the lone samurai who stands against the tide.

Drawing upon your latent draconic heritage you can use a bonus action to enter into a state of being known as "Draconian Ascendance". While in this state, a draconic shroud covers your entire body while your physical body begins to take on more pronounced features. Your teeth sharpen, your horns become more elongated, your eyes shift into a more reptilian visage and a series of scales begins to partially cover your body. This form lasts for 1 hour, or until you are rendered incapacitated. If this form ends early, you can either use your Action Surge to reenter this state; forgoing the extra action it gives you, or you can use another bonus action at the expense of taking on 1 point of exhaustion. When the form ends, any remaining benefits given end with it. While in this form your Fighting Spirit becomes enhanced and your melee strikes hit harder as the tide of combat begins to flow in your advantage.

Dragon's Vitality: "The shroud of your form now serves to extend your endurance as well as being able to protect your trusted allies." When you use your Fighting Spirit you can now give out temporary HP equal to 15 times half your Constitution Modifier to an amount of creatures equal to half your proficiency bonus within 30ft of yourself.
Dragon's Shroud: "Those who stand near your shroud can now feel this protective warmth as its reach provides a thin layer of protection as if commanded by your desire to protect others."  When a creature with temporary hit points from Dragon's Vitality is subjected to an effect that forces a saving throw; it can use its reaction to expend temporary hit points in multiples of five, for every five temporary hit points expended they gain a bonus of +1 to that save. This can be done after a save is rolled but before consequences are carried out (or after if avrae automated needs a recon)
Dragon's Rage: "The beast within you stirs as your shroud reaches out to attune to the powers you amass and convert it to raw might." Your weapon attacks deal an additional 1d8 damage dice for each instance of additional advantage you have on the attack.