Falbium Asmodeus, formerly known as Falbium Glasya-Labolas, was the Satan Asmodeus who was in charge of Military Affairs, prior to the events of 666. He is related to Zephyrdor Glasya-Labolas and the unnamed deceased former heir.


Falbium is a tall man whose head is completely bald and has a goatee on his chin.


Falbium is a very lazy person, spending most of his time sleeping, and lives by the thought that “working means losing”. He is usually unenthusiastic in doing anything.


Falbium came from the House of Glasya-Labolas and was part of the Anti-Satan Faction before being promoted into the Satan Asmodeus sometime before the series began.


Birth of the Breast Dragon Emperor

He first appears in Volume 5 during the Young Devils Gathering.

The Heroic Oppai Dragon

In Volume 8, Falbium acted as Satan Green and test both Issei and Rias on table manners during their trials at the Ruins of Connection.

While Falbium did not appear in Volume 12, he was the one in charge of the battle strategy to counter the attack by the 12 Bandersnatch created by Leonardo's Annihilation Maker.

The Legend of Oppai Dragon and his Lively Companions

In Volume 21, at the end of the war against Qlippoth to finish off Trihexa. Falbium and some of other mythology leaders and their peerage began to implement Azazel's plan of trapping 666 inside the Isolation Barrier Field along with themselves.

Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star: The True Dragon(s) of the Kuoh Academy

In Volume 22, it is revealed Ajuka is able to communicate with Falbium and the rest who are fighting Trihexa in the Barrier Field via a large screen displaying a live broadcast of them within his personal research facility.

In Volume 24, when Ajuka was alone in his own research facility, he engaged in a conversation with the ones who were in the Isolation Barrier Field battling Trihexa. Their agenda was for Issei and Vali to be named the next Satan successors for the new 7 Great Satans System. When deciding on which title would suit Issei, Azazel was leaned more towards Asmodeus as it represented lust, Falbium showed no objection with Issei succeeding his title but refuted Azazel saying that he himself was not lustful.

Powers & Abilities

Immense Demonic Power: As one of the Four Satans, it is presumed that Falbium is an extremely powerful Devil.

Master Tactician: Falbium is also known for being the Underworld’s greatest tactician and strategist and has gathered many talented subordinates.



  1. High School DxD Light Novel Volume 8 Afterword