@TheSunsetStar yes If you change your mind in the future, the name of the dragon that Rhaenys may have is Ancalagon the black, he is the greatest dragon in literature and he appears in the book The Silmarillion written by Professor J.L.R Tolkien, who was the same author of The Hobbit and the Lord of the rings and the ancalagon is much bigger than the balerion I researched the balerion is small next to the ancalagon.