Dragon Queen (Updated)

Prestige 2:

Growth of Dragon - You've grown scales on parts of your body that reflect a certain dragon - giving you immunity to that type which last until you change the type. You may change these scales to a different type (changing the damage immunity as well) as a free action once per turn. Additionally, you grow wings that can be furled and unfurled at will and give you a flying speed of 120ft. Also, whenever you deal damage you may change the damage type to your Growth of Dragon type and deal an additional 1d6 damage.

Draconic Blessing - Whenever you touch a dragon or a dragon egg, you may imbue it with your energy. When it would be reduced to 0 hit points, it is instead reduced to 1 hit point and immediately teleported to one of your domains. This Blessing remains indefinitely, unless the dragon chooses not to, and any dragon born from a blessed egg gets to keep the blessing. You can give this blessing a number of times equal to double your proficiency bonus, regaining all expended uses on a long rest.

Prestige 4:

One with the Dragons - Your creature type changes to Dragon and any dragon that can sense you knows who you are and considers you friendly, even with an effect that would determine otherwise. You know the location (as well as type and age) of any dragons within 10 miles of you. Dragons also know of your exact location in that range and may come to your aid if they so choose. Any check made to communicate with dragons is made with advantage as they see you as one of their own.

Safe Haven - You may use an action to touch one willing dragon and teleport them to one of your domains that is the same realm as you're currently in. You can alternatively target a group of dragons that you can see and spend one minute to teleport them all to that domain.

Prestige 6:

Queen - You may transform into any dragon of your choice as an action. Your stats and abilities change to match the dragon, but your mental scores remain the same. If you were to be reduced to 0 in this form you become unconscious and make death save as normal. Any dragon that is younger would be very inclined to listen to your commands whilst in this form.

Draconic Awakening - When you use your Strength before Death feature, your draconic side takes over. You regain all your hit points and expended charges of all your abilities besides Strength before Death. For the next minute all of your attacks have advantage and your action surge grants two additional actions instead of one as your draconic fury takes over.

Prestige 8:

Caretaker - Any dragon within your presence (excluding yourself) is cleansed entirely and may not receive any negate effects whatsoever, which includes damage. You may use an action to touch a dragon, dead or alive, within your presence (excluding yourself) to restore them to their maximum hit points and revived if dead (exceeding wish), recharge their breath attack and their awakened form. If a dragon is brought back to life in this way, they choose not to leave your domain under circumstance (this also prevents forced movement). Once you use this on a dragon, you can not do so again against that dragon until it has taken a long rest. 

Dragon of Tertia - Each time a dragon evolves or is brought into your domain (born or not), you gain 1 energy from your domain. This energy is immediately spent to give dragons within the realm peace of mind as well as granting them echoes which strengthen their resolves. These echoes take on a spiritual form of one of the dragons currently residing in your domain - Each energy expended creates 1 echo for a dragon. Once you have created an echo of all the dragons within your domain, those echoes then fly over Tertia - much like the auroura borealis - and symbolise the mark you've made on the realm. Any dragon who is watching this becomes calmed and creates a closer bond with their companion (if they have one). A dragon that does not have a companion has an echo of their most desired companion to keep them company during the event. The echos then disappear after 24 hours of the event starting, to replay the cycle.