Boon of Dragon Thrall

Epic Boon Feat (Prerequisite: Level 19+)

You gain the following benefits.

Ability Score Increase. Increase your Intelligence, Wisdom, or Charisma score by 4, to a maximum of 30.

Dragon Thrall. Upon gaining this boon, roll a d10, magically summoning a dragon of the matching roll (if you received this boon from Tiamat or Bahamut, the DM chooses the appropriate dragon for your service, instead):

1. Ancient Gold Dragon
2. Ancient Red Dragon
3. Ancient Bronze Dragon
4. Ancient Blue Dragon
5. Ancient Copper Dragon
6. Ancient White Dragon
7. Ancient Brass Dragon
8. Ancient Green Dragon
9. Ancient Silver Dragon
10. Ancient Black Dragon

The summoned dragon is completely loyal to you and obeys your telepathic commands without question. While the dragon is alive, you gain the following benefits:

• A bonus to your AC, attack rolls, damage rolls, and saving throws equal to the dragon's Challenge Rating.
• You regain hit points equal to the Dragon's Constitution score at the start of each of your turns.
• You are immune and resistant to the same damage types as the dragon, and vice versa.
• You and the dragon no longer suffer the negative effects of age, and cannot be aged magically.
• As an action, you can unleash the dragon's breath weapon from your position, as if the dragon was in your space. If you do, the dragon must recharge its breath weapon as if it had used its breath weapon, but with advantage.

The summoned dragon gains the same bonuses to its AC, attack rolls, damage rolls, and saving throws equal to your Highest Ability Score, regains hit points at the start of each of its turns equal to your Constitution score, and can utilize the abilities of your Character Class and Subclass. It always acts immediately after you in the initiative order of combat.