Way of the Ancient Diamond

The Way of the Ancient Diamond is named after the Blue Dragon of the Draconic Prophecy, it is said that after helping the couatls the blue dragon was blessed by Syberus gaining a new form that would represent his good character becoming the first and only Diamond Dragon to roam Eberron.

In the era of giants it is said that the Ancient Diamond, as he was called, trained good-hearted people to battle Khyber with Draconic power,  the old training consisted on getting the feral dragon inside to unveil and be born, for this people went through extreme pain and concentration to have a Dragonmark appear on them.

The Dragonmark of the Ancient is a mark that appears in the heart of a creature that survived the Training of the Polish, this dragonmark is formed of the P symbol in draconic and it is said to be the initial letter of the Diamond Dragons name or representing the Polish the humanoid went through, it is blue and doesn't glow.

After manifesting the mark the humanoid would turn more feral, they would have the mannerisms and habits of a Dragon, generally they would speak in a very gutural broken common or speak in just Draconic if they know the language. The Ancient now would teach them the basics of martial combat and how a calm mind and a controlled body would activate the mark, then, if worthy, he would promote the apprentice to a master and he would be responsible in teaching the way and Fighting the demons from Khyber. The tradition now has around 100,000 years old and is still a very secluded and difficult art, most people either abandon or die during the Training of the Polish.

The art has only now finally left Argonnessen and reached Khorvaire after a great explosion made the current commander of the Diamonds apprehensive of Khyber's return

The Silver flame was founded in the same time and so before The Ancient Diamond went back to Argonnessen they helped each other this is why the Silver Flame knows of the Diamonds and respects them, a monk of the Way of the Ancient Diamond will be helped by someone of the Church of the Silver Flame and vice versa.

Draconic Polish

When you go throught the Traning of the Polish and choose this monastic tradition at 3rd level, you aquire the Dragonmark of the Ancients. You also learn to write, read and speak Draconic.

Art of the Breath

Starting at 3rd level, you gain the ability to harness the breath weapon of the dragon.

As a bonus action you can spend 2 ki points to release a damaging 15ft cone of Lightning that deals 3xdMA (3 times your martial arts die) in damage, you can spend additional ki points to add a die to the roll to a maximum of 10 dice (10xdMA). Any affected creature must make a Dexterity saving throw equal to 8 + your proficiency bonus + your Wisdom Modifier. on a successful save, the creature takes half damage.

The cone extends to 30ft at 11th level, and to 45ft at 17th level.

This breath weapon is not considered a magical effect for spells such as:
Antimagic Field, Counterspell or a Beholder's antimagic cone.

Draconic Defiance

At 6th level, your body becomes so used to your Dragonmark that you gain resistance to Lightning damage and the mark now expands from just the chest to the neck and left arm.
Your knowledge of a dragon's body gives you superior capability against one in combat, whenever you hit a dragon and use your Stunning Strike , the dragon has disadvantage on its saving throw.

Overwhelming Breath

At 6th level, your Dragonmark evolved so much that you breath weapon can cut through a creatures resistance. A creature that is resistant  to the element of your breath weapon is treated as not resistant and a creature that is immune to the element of your breath weapon is treated as being resistant.

Wild Flight

Beginning at 11th level, you mark consumes your back and through it's power you can awaken your dragon wings. You can spend 5 ki points to manifest lightning wings within your mark and gain a flying speed of 60ft for one hour. You spend additional ki points to extend the flight time by one hour per ki point.

at 17th level, the fly speed increases to 80ft.

Second Elemental Facet

At 11th level, your mark gives you access to the full Diamond Dragon breath. Your breath weapon can now shoot Cold instead of Lightning, you have to say the element chosen before rolling the dice.

Overpowered Draconic Element

At 17th level, you can unleash a powerful burst of you breath weapon. You ignore the limit of dice for you breath weapon and the damage is 2d10 for every ki point used to a maximum of 40d10. Once used this feature can't be used again until you finish a long rest.

Absolute Fusion

At 17th level, your Dragonmark now encompasses your neck, both arms, chest, back and a part of your face, with your superior mark you are now able to fuse your Draconic Elements together. Whenever you use your breath weapon you can choose to roll any number of dice as either element.