Dragoon

Fighters trained in the ancient ways of Dragonslaying, they ise techniques specifically designed to pierce dragon hide. Their resolve is absolute, and their prupose is to rid the world of the vile beasts. While this is their training, they excel in combat with creatures other than dragons. Their leaping ability makes things difficult for any kind of foe.

Dragon Fang

When you take this archetype at 3rd level, your training to fight dragons has given you the ability to jump into the sky to deliver swift, painful blows. When you make an attack with a melee weapon, you may do so and jump as if under the effects of the "Jump" spell. Aattacking in this way deals an extra 2d8 piercing damage; however, due to the extreme nature of this attack, miding can be costly. If you miss an attack while airborne, you suffer 2d6 points ofbludgeoning damage as you fall from the sky.

Elemental Resiliance

Starting at 7th level, you have learned how to deal with the dragons of today by fighting off the elements affixed with them. You may gain resistance in one of the following elemental types: Acid, Cold, Fire, Lightning, or Poison. You may gain another elemental resistance at 16th level.

Elemental Resiliance: Acid

You gain resistance to acid damage.

Elemental Resiliance: Cold

You gain resistance to cold damage.

Elemental Resiliance: Fire

You gain resistance to fire damage.

Elemental Resiliance: Lightning

You gain resistance to lightning damage.

Elemental Resiliance: Poison

You gain resistance to poison damage.

Dragon Slayer

Starting at 10th level, your knowledge of dragons, their tactics, and their history is nigh uncontested. You gain advantage on all Nature (int), History (int), Perception (wis), and Survival (wis) that have to do with Dragons or Dragonkin. Additionally, whenever you roll damage against a dragon, you may reroll any 1s, 2s, or 3s on the damage die.

Improved Dragon Fang

Starting at 15th level, your draconic combat training has progressed, making you a deadlier foe. When you use the Dragon Fang feature, your damage increases to 4d8 extra damage. In addition, if you attack a dragon in this way, maximize your damage; however, you take more damage from your fall if you miss. If you miss your attack while attacking in this way, you take 4d6 bludgeoning damage and the next attack against you has advantage as you recover. 

Dragon Lord

Starting at 18th level, you may enter a heightened state of draconic combat. For one minute, as an action, you may gain the damage boost from your Dragon Fang without any damage being done to yourself or having to actually jump. If you choose to jump while in this state, you deal an additional 2d10 piercing damage and have advantage on your attacks. Once you use this, you must finish a long rest before you use it without consequence. If you use this ability again before a long rest is completed, you take 2d10 force damage and a level of exhaustion.