Quasi-medieval world. Many vie to rule it. There are legends of an existential threat (white walkers commanding an army of risen dead), largely scoffeed at, but guarded against anyway.
The current king, who is king because the previous king is offed, dies in a hunting accident - possibly arranged by his wife. This wife made babies with her twin brother, passing them off as the king’s.
King’s buddy (a ruler of a significant chunk of the land) finds out about the shenanigans, and is offed.
Hunting-accident king’s son is offed, to enjoyment of the watching public. Everyone now wants the throne, intrigue, battles, homicidal weddings are had. Many people are offed.
Meanwhile, across the sea, the believed-dead daughter (bdd) of king-prior-to-hunting-accident-king goes from near-slave to ruling cities, partly by metaphorically giving birth to no-shit dragons (3). Dragons burn shit.
Hunting-accident-king (hak)’s wife (hakw) gets into some issues with local religious movement, and is brought low, but in the end burns them and big chunks of the main city. Her last remaining child commits suicide, giving her an even bleaker outlook on life.
Bdd crosses the sea, with armies and dragons. The existential threat is proven real, but hakw will not help deal with it. Bdd, however will. Existential threat is fought at hak’s dead budy’s castle, and ended by hak dead buddy’s youngest daughter, because she has become a super ninja shapeshifter assasin in the mean time.
Hak dead buddy’s bastard son, (hakdbbs) who was main guy dealing with existential threat for years, turns out to be not his bastard son, but actual heir to the throne, ahead of Bdd. But since he believes a deal is a deal, and he promised to support the bdd (with whom he has had cqrnal relations and dragon joyrides) as rightful queen in return for help with the existential threat, he has no desire to assume his rightful place. This upsets his buddies and family, who like him better than bdd.
They decide to off hakw (and have bdd become queen, or sort shit out later, depending on character’s viewpoint). In the process, bdd and her last remaining dragon commit mass murder against the civilian population, for reasons argued about incessantly on-line. Bdd holds a speech, in a setting straight out of a Leni Riefenstahl wet dream, telling everyone she is going to continue liberating chunks of the world by making many people dead. This is disconcerting to hakdbbs, who kills her while kissing her. He is sent off to a sparsely populated part of the realm, but his youngest half-brother, who had the power to astrally travel in space and time and take over animal minds, but did nothing much with this power, is made king.
Somewhere in there, a very soulful little person kills his dad while on the shitter, a cynical knight errant turns out to be the most morally consistent character of the show and dies while killing his big brother, some quasi-vikings are less awesome at boating than you would seem, and many,many more people die than can possibly related here.