In the acknowledgments of "Brisingr," Paolini acknowledged the influence of Leon and Hiroko Kapp's "The Craft of the Japanese Sword" for his description of the forging of Eragon's sword. Additionally, Paolini admitted he is a "Doctor Who" fan, which inspired his reference to the "lonely god" (the epithet given to the Doctor by the Face of Boe in the episode "New Earth"), to "rooms that are bigger on the inside than the outside" (from "Questions Unanswered" in "Inheritance"), as well as to Raxacoricofallapatorius, the home of the Slitheen ("Blood Price" in "Inheritance").