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Japanese (Ruby) ベルゼバブ
Japanese (Base) 神蝕篇帙
Base meaning Tome of Divine Corruption
Novel Debut Volume 13
Anime Debut Season 4 Episode 3

Beelzebub (神蝕篇帙ベルゼバブ, Beruzebabu?) is the Demon King of knowledge corresponding to the second order of the qliphoth. Its original wielder is the Inverse Form of Nia Honjo, and it normally takes the form of a book with crosses on its covers.


Nia Honjo[]

Nia inversed after being forced to remember the excruciating pain she suffered in her suppressed memories of DEM's torture. Her Demon King <Beelzebub> retains <Rasiel>'s information gathering and future describing, with the latter ability now utilized at a much faster rate than in her normal state against the Spirits in their limited Astral Dresses. It can also summon shadow-like creatures from the pages. She cannot distinguish friend from foe in this state. Because her Inversion was caused by her agony, Shido started to reawaken her consciousness with <Gabriel>'s pain-relieving Requiem. However, her Qlipha Crystal was extracted by Artemisia Bell Ashcroft and given to Westcott before he could properly change her back to normal.

Sir Isaac Ray Pelham Westcott[]

<Beelzebub> has the ability to transfer information about a subject directly into its user's mind, as shown when Westcott found out about Shido changing the past during the events of Tobiichi Devil. Westcott can then freely share this information with others just by simply touching them. The demonic book can also summon shadow-like creatures from its pages that follow his every command. The pages themselves can serve as a shield capable of blocking attacks from sealed Spirits. They can also be used offensively, as he prepared to stab Shido with one during their fight before Miku and Natsumi intervened. Despite his own admission that <Beelzebub> is lacking in direct combat, he used this Demon King to match Elliot, one of the most powerful Wizards in the world, in a one-on-one confrontation. Westcott was even able to slice off Elliot's arm and leg, albeit at the cost of one of his own arms.

However, since Nia's Inverse Form was in an incomplete state because of Shido's intervention, only a part of her Qlipha Crystal was extracted. As a result, Westcott's <Beelzebub> is also in an imperfect state, implying that the Demon King is not as powerful as it was when Nia was using it. Nia explains that neither of them can use their most powerful ability, future entry. Additionally, <Beelzebub> still shares a connection to Nia's angel <Rasiel>, as the two used to be two sides of the same embodiment. As a result, Nia can sabotage <Beelzebub> by interfering with its information network, which she has used to further weaken the Demon King. Nia also states <Beelzebub> shares <Rasiel>'s weakness of being incapable of predicting the future and reading a person's inner thoughts. After Kurumi Tokisaki forcibly takes back Nia's Qlipha Crystal and reverts it back to a Sephira Crystal, Westcott loses access to <Beelzebub>.

So far, <Beelzebub> has shown to have the following abilities under Westcott's command:

  • Ashufiriya (幻書館アシュフィリヤ, Ashufiriya?. lit. "Phantom Library"): After summoning <Beelzebub>, Westcott traps the targets into the book and transports them into an adjacent world created by <Beelzebub>. According to Nia, the world is created by various scenarios made by people's dreams and imagination. The people imprisoned assume the roles of fairy tale and manga characters, though several alterations might be made to the source material. While trapped within the fantasy world, other Spirits are unable to use their Angels.
  • Nibelcole (魔王の娘たちニベルコル, Niberukoru?. lit. "Daughters of the Demon King"): Summons various soldiers from <Beelzebub>'s pages, all of whom bear a striking resemblance to Marina Arusu. The Psuedo-Spirits have a hive mind which can be linked with Westcott's senses. However, due to <Beelzebub>'s connection with <Rasiel>, the Nibelcole has a significant weakness despite their great numbers. Because Shido still has Nia's affections, he is able to seal the Nibelcole with a kiss, causing them to revert back into paper and fade away into light particles. They also disappear when Kurumi removes Westcott's Qlipha Crystal, the source of their power.


  • Beelzebub is the name derived from a Philistine god and later adopted by some Abrahamic religions as a major demon.



Demon Kings
Demon Kings