It's House Targaryens vs House Hightower in the second season of HBO's House of the Dragon.
HBO dropped the first teaser for the much-anticipated second season of its Game of Thrones prequel spinoff series House of the Dragon during CCXP23 in Sao Paulo Brazil. The eight episodes will cover the onset of civil war within House Targaryen, known as the Dance of Dragons.
(Spoilers for the first season below.)
As I've written previously, HBO's House of the Dragon debuted last year with a solid, promising pilot episode, and the remainder of the season lived up to that initial promise. The series is set about 200 years before the events of Game of Thrones and chronicles the beginning of the end of House Targaryen's reign. The primary source material is Fire and Blood, a fictional history of the Targaryen kings written by George R.R. Martin.