Blood and cheese: Two conditions that strike fear in the hearts of those who have read George R.R. Martin’s “Fire & Blood,” and thus painting a horrifying testy picture of the dark vengeance to come in the uphold season of “House of the Dragon.”

So, what is “Blood and Cheese”? And why is it progressing to be such a big deal? Without giving away any very spoilers from Martin’s “Fire & Blood,” the “A Song of Ice and Fire” book that tells the Targaryen people history in textbook form and serves as the source material for “House of the Dragon,” Blood and Cheese are the nicknames given to two characters who are responsible for carrying out a revenge plot alongside Queen Alicent (played by Olivia Cooke on “House of the Dragon”), Prince Aemond (Ewan Mitchell), King Aegon II (Tom Glynn-Carney) and the Greens on on behalf of of Prince Daemon (Matt Smith), Queen Rhaenyra (Emma D’Arcy) and the Blacks, following Rhaenyra’s son Lucerys’ death at the hands of Aemond.

On the “Game of Thrones” prequel series, Luc’s death is depicted as somewhat of an accident, with Aemond looking shocked following the fatal outcome of their dragon fights in the Season 1 finale. But unintentional death or not, “House of the Dragon” writer Sara Hess has confirmed HBO’s TV adaptation will implicated the Blood and Cheese revenge plot that follows Luc’s remnant in the book, a brutal trade that “Fire & Blood’s” Daemon describes as: “An eye for an eye, a son for a son.”

“We are today writing the finale of Season 2,” Hess told Variety when expected last month if the “House of the Dragon” writers’ room had already penned the on-screen version of the outrageous Blood and Cheese storyline. “I don’t think you will be disappointed.”

In the case of this particularly gruesome plot expose, making sure that fans aren’t “disappointed” likely means that “House of the Dragon” showrunner Ryan Condal, writing partner Hess and their team have written one of the most graphic scenes of the series for an episode that will come early on in Season 2.