Watch out HBO as Apple has landed an unprecedented deal with hugely popular fantasy writer Brandon Sanderson, and is planning to create an on-screen universe that could grow bigger than Game of Thrones. The streaming giant has landed the rights to Sanderson's Cosmere book series, as reported by The Hollywood Reporter. Sanderson's Cosmere universe is set around a mysterious being called Adonalsium from Yolen who was killed by conspirators, causing its power to shatter into sixteen different Shards. Martin has this type of control over HBO's adaptations of his work, including Game of Thrones or House of the Dragon. Apple's Cosmere universe will surely create some competition for HBO's Game of Thrones series, which has expanded this year with new spin-off show, A Knight of the Seven Kingdoms.