Chromatic Dragon Knights

When Tiamat wishes to gain even more power, she may sometimes appoint some mortals or failed dragon Knights as her own group of Chromatic Dragon Knights to do her bidding and exercise the evil within them

Channel Divinity

You gain two Channel Divinity options:

Dragon Archon - As an action, you may summon a young chromatic dragon as your stead. This steed can only take the dodge, dash, and disengage action unless a feature allows otherwise. This steed has a number of hit points equal to 10 times your paladin level. Once you select a steed you cannot change your steeds dragon type. This steed lasts for a number of hours equal to half your paladin level rounded down. 

Enlargement - As an action, you may increase the size of your mount by 1 for 8 hours. You may end this enlargement using a bonus action. 

Oath Spells

You gain oath spells at the paladin levels listed.

Oath of Devotion Spells

Draconic Mastery

Your steed gains the ability to use it's action to make a single attack. This creatures weapons are considered magical for the purpose of overcoming immunities and resistances to bludgeoning, pericing, and slashing damage from non magical abilities.

At level 18 it get's to use it's breath weapon and multiattack

Draconic Spirit

You can merge together with your dragon as a bonus action. When you do this, you gain acess to the multiattack and breath attack options. 

Outside of being merged with your dragon, you can choose to deal an extra 1d8 damage on hit asccociated with the dragon that you chose as your steed if you are at least within 30 ft of your Steed.

If you sprout wings and gain a flying speed equal to your movement speed

Harbinger of Tiamat

You have been so infused with Bahamuts Power and have experienced so much with your steed that it becomes one with you. You can summon your steed for free as a bonus action, and when you do so it becomes an adult dragon You can use this feature a number of times equal to your charisma modifier. You gain a flying speed equal to 80 ft.

You can spend your action to merge together with your mount. When you merge with your mount in this way you can choose to gain the following benefits for the next minute. 
- You are considered to be an Ancient dragon of your choice depending on the color of your dragon. You cannot use legendary actions or legendary resistances. You return back to normal once you hit 0 hit points in this form.