Dragon Knight

A human clad in gleaming plate armour stares down a
snarling owlbear, slowly reaching for the lance strapped
across her back. The owlbear charges before she can reach her weapon, but a gout of fire from the sky stops the owlbear in its tracks. The gold dragon lands in front of the human, its eyes burning with a fiery vengeance as it snorts, causing flames to billow from its nostrils. Mounting her dragon, the human lets out a war cry as the dragon takes off into the air.

Pulling the bowstring back, the elf whispers a few hushed words as an arcane fire erupts around the goblins below. Lightning sparks at the tip of his arrow, and he grins to himself as he fires at the goblin chief. The arrow finding its mark, the goblin chief can barely cry for help as lightning explodes from his body, arcing off to his nearby guards. In the trees, a nearby blue dragon chuckles to itself as it descends upon those left.

The platinum dragon sniffs at some rubble before nudging it, looking back towards a halfling. She comes over and together they shift the rocks. Reaching her hand out, the halfling brushes the hair out of the eyes of the small boy who lies in the rubble. A shield of divine magic wraps around his small frame as the halfling pulls him into her arms, carrying him to safety.

Scowling to himself, the half-orc looks around the darkened cave for his quarry. Letting out a short whistle, a dark dragon, onyx in colour, seems to appear from the shadows with a dead drow in its maw. Rolling his eyes, the half-orc makes a motion with his hands, and the dragon spits out the drow, a sheepish expression on its reptilian face as darkness begins to swirl around the pair, causing them to vanish.

While different in personality and fighting styles, all of these heroes are dragon knights, a champion who fights alongside a dragon companion. Tough, relentless, and unyielding, knights and their dragons never give up, fighting to either heroic or devious ends.

Dragon's Fury

Beginning when you choose this archetype at 3rd level, your dragon companion is ready for battle, and can now take the Attack action in combat.

Additionally, your dragon gains the following attack options, which it can use with the Attack action. Your dragon is proficient with them, and adds its Strength modifier to their attack and damage rolls. If an option causes a creature to make a saving throw, the save DC is equal to 8 + your proficiency bonus + the dragon's Strength modifier. Your dragon can use these attack options a number of times equal to its Strength modifier (minimum of once.) It regains any expended uses when it finishes a short or long rest.

Eye for Detail

Also at 3rd level, you can easily discern the value and rarity of gems, art pieces, and magical items. You can spend 1 minute studying a gem or art piece, after which you learn it's exact value. Additionally, if it is a gemstone, you learn what kind of gemstone it is. If it's an art piece, you learn how old it is.

Furthermore, you can cast the identify spell, but only as a ritual. You don't require material components for the spell when you cast it this way.

Draconic Growth

Starting at 7th level, your dragon companion's flying speed increases by 15 feet, its other speeds increase by 10 feet, and it no longer falls to the ground if it ends its turn in the air. At 10th level its flying speed and other speeds increase by a further 15 feet and 10 feet respectively.

 

As an action on its turn, the dragon can exhale this destructive energy. Each creature in the area takes 4d6 damage on a failed save, or half as much on a successful one, with the saving throw calculated as follows:

Dragon's Eye

At 10th level, you and your dragon's keen understanding of each other allows you to better act in battle. You and your dragon can add your Charisma modifier to each of your initiative rolls. Additionally, if you can see your dragon, creatures that it can see don't gain advantage on attack rolls against you as a result of being hidden from you.

At this level, you also gain proficiency in all charisma saving throws. 

Draconic Advancement

Starting at 15th level, your dragon companion matures, allowing you to fight together more fluidly. Your dragon companion's size is now large, it can be used as a mount, and it is able to fly with a creature it has grappled. Additionally, as long as your dragon companion can see you, it has advantage on all saving throws.

Titanic Roar

Starting at 15th level, your dragon can let loose a vicious roar, filling nearby creatures with dread.

As an action on its turn, your dragon can roar. Any number of creatures of your choice within 20 feet of the dragon must make a Wisdom saving throw against the dragon's breath weapon DC. On a failed save, creatures are frightened of the dragon for 1 minute. The creature can repeat the saving throw at the end each of their turns, ending the effect on a success.

Once your dragon has used this ability, it can't do so again until you finish a long rest. At 18th level, the range increases to 60 feet.

Fulfilled Covenant

At 18th level, you have been blessed with a dragon's extended lifespan. You age only one year for every ten years that pass, and can't be aged magically.

Also, you take on the physical aspects of a dragon. You gain resistance to the damage type associated with your Draconic Covenant, and you gain one of the following benefits:

Eyes

Your eyes become sharp and focused. You gain proficiency in the Perception and Investigation skills if you aren't already, and you have advantage on any (Wisdom) Perception or (Intelligence) Investigation checks based on sight.

Scales

Scales cover sections of your body, helping shield you from harm. While you aren't wearing armour, your AC equals 10 + your Dexterity modifier + your Charisma modifier. You can still wield a shield and get this benefit.

Tail