Taking the shape of a stylized broadsword, Caliburn is large and heavy with no actual cutting point; rather, the edge of the blade is flat and sharp, taking a shape reminiscent of a guillotine. The golden pommel at the end of the hilt appears to possess a face which speaks without moving.
Caliburn seems almost single-mindedly obsessed with Arthur to the extent where his hobby is thinking about Arthur and his favorite words are everything Arthur says. Even his favorite pastime is defeating demons alongside the Paladin.
Caliburn was once stored in the depths of the Vatican Main Office, stuck in a mysterious pedestal. Arthur, wishing for a reward for his work, made a contract with Caliburn and pulled him from the pedestal and has been using Caliburn for a long time since.
Training Camp arc
Caliburn originally appears alongside Arthur when the Paladin attempted to kill the Spawn of Satan. The execution of Rin is however postponed in favor of taking him as material evidence in the case against Mephisto Pheles.
True Cross Academy Festival arc
In Yemen, Arthur arrives on the scene of a similar incident to the one that had just transpired in Kyoto. Faced with the powerful demon, the Impure Princess, Arthur remarks his disgust at having been left out of the battle with the Impure King. Determined to prove himself, he asks Caliburn to lend him power. Caliburn replies that in order to defeat the Princess, he will need a sacrifice of at least Arthur's hair. Giving it gladly, the pair attack the castle form of the Impure Princess and destroy it with a single blow.
Powers & Abilities
Whilst Caliburn seems to be incapable of moving on his own, he does allow his wielder access to various powers and techniques.
- Zodiac Slash: Utilizing Caliburn, Arthur encases his body in energy that takes the shape of his sword and charges upward. The attack is capable of destroying multiple enemies at once, but the higher he travels, the more momentum Arthur loses, resulting in power loss and potential interruption of the attack.
- Angel Slash (エンジェルスラッシュ Enjeru Surasshu): After cutting a lock of his hair with Caliburn, Arthur swings the Demon Sword and creates a destructive wave of energy that can completely destroy something the likes of the Impure Princess in a single hit.
- Caliburn's favorite food is Arthur’s hair.
- Caliburn's favorite type of man is a noble, beautiful, capable paladin.
- Caliburn is an alternative name for the holy sword, Excalibur, which was the sword wielded by King Arthur.
- The word "Caliburn" is most commonly affiliated with the Sword in the Stone.
- In an edition of "Blue Questorcist", it is explained that Caliburn was originally supposed to have a male voice, but in the anime has a female voice.
- Ao no Exorcist Manga: Chapter 14, Page 14
- Blue Exorcist True Cross Order Guide
- Jumpfesta 2019 Pol Winner 1 Tweet - https://twitter.com/katohhhhhh/status/1244544529601933313
- Ao no Exorcist Manga: Chapter 14, Page 15
- Ao no Exorcist Manga: Chapter 14, Page 19
- Ao no Exorcist Manga: Chapter 38, Pages 12-22
- Ao no Exorcist Anime: Episode 25
- Ao no Exorcist Manga: Chapter 38, Pages 18-22