HBO is reportedly close to green lighting another Game of Thrones Prequel spin-off. This story is based on George R.R. Martin's Fire and Blood book, which he teased back in May. According to sources, the new series is nearing a pilot order from the network, which should be huge news for fans. HBO has been hard at work on proposals for at least five prequel and spin-off ideas, which were all discussed before the final season of the hit show even premiered.

Fire and Blood takes place 300 years before Game of Thrones and "tracks the beginning of the end for House Targaryen." George R.R. Martin is on board as an executive producer, alongside Ryan Condal and the project has reportedly been in development since last fall. According to sources, the prequel series "represents a brand new take on a world originally tackled by Bryan Cogman in one of the five Game of Thrones prequel scripts commissioned by HBO in 2017." Cogman revealed earlier this year that his idea was not moving forward.

RELATED: Game of Thrones Fans Are Celebrating 10th Anniversary of the Premiere Episode on HBO

George R.R. Martin was leaving clues about a Fire and Ice adaptation back in May. The author talked about the upcoming spin-offs and cryptically teased, "What are they about? I cannot say. But maybe some of you should pick up a copy of Fire and Blood and come up with your own theories." So, fans more than likely saw this coming from a mile away. However, the show has not officially been picked up by HBO, who have also declined to comment on the new series.

One untitled Game of Thrones prequel, written by Jane Goldman and starring Naomi Watts, shot a pilot this summer. It has yet to be officially picked up by HBO at this time, though it probably will be. Fire and Blood starts with Aegon the Conqueror, who is the first Targaryen king of Westeros. Aegon conquered Westeros with his siblings, and the story goes all the way through Aerys II, and the Mad King. While that certainly sounds exciting, there are some problems with it that many fans will find very familiar.

The biggest problem with Fire and Blood is the fact that it is not complete. George R.R. Martin has only completed the first of a planned two volumes and we all know how fast Martin writes his books. This was a huge problem for the original Game of Thrones series, although Martin reportedly gave showrunners D.B. Weiss and David Benioff some rough outlines of the future on napkins and scraps of paper when he couldn't keep up with the show. Another problem that some fans have with Fire and Blood is the fact that it's kind of boring. It's 700 pages and there have been comparisons to school history books, which does not sound very exciting at all. Regardless, Martin seems pretty excited about it. Deadline was the first to report on the new Game of Thrones prequel series.