Hellmaster Fibrizo (Japanese: 冥王 フィブリゾ, lit. herumasutā fiburizo and romanized as Hellmaster Phibrizzo in English, Runic: ᚠᛁᛒᛦᛁᛋᚫ Fibrizo) is the most powerful of the five subordinates in service to Ruby Eye Shabranigdu and the main antagonist for the last episodes of Slayers NEXT. He is voiced by Kazue Ikura in the Japanese version and by Vinnie Penna in the English dub by Central Park Media (Software Sculptors).
Fibrizo one of the names listed on the Plane chart and is based on Astaroth in the Ars Goetia. Software Sculptors erroneously romanized his name as Phibrizzo. While it might be interpreted as an alternate translation, the plane chart has very clear runic writings regarding the names of the mazoku, and his translates plainly to Fibrizo.
Hellmaster Phibrizzo was created during the Shinma War, and is over 5000 years old; he is the lord of the underworld, and controller of life and death. Hellmaster's priest and general were destroyed in the Kōma War, and it is assumed that to create new ones would deplete much of his existing power.
Placed at the center of five points according to the accepted cardinal positions of the Sorceror's Guild, Hellmaster has a bit of domain over his siblings, so much so that he was granted Greater Beast Zelas Metallium's only servant, Xelloss, during the run of Slayers NEXT. Capable of destroying a fellow lord like Chaos Dragon Garv with but a snap of his fingers, Fibrizo is possibly the greatest force of chaos to be reckoned with on the immediate plane shy of Ruby Eye Shabranigdu itself.
Despite his power and eagerness to fulfill his master's goals of destroying everything in existence, Fibrizo rarely involved himself in the day to day matters of the world; he was more of the scheming type. He was known to patiently wait for hundreds or even thousands of years, and when everything was in place, unleash his plan to the most devastating effect. He was the one who ignited the Kōma War, which at first was a conflict between humans, to use the horrors of the war to awaken the piece of Shabranigdu in Lei Magnus, a legendary great sage. He apparently succeeded, turning the war into one of the greatest conflicts of all time. However, in the end, Lei Magnus-Shabranigdu was sealed into ice, and Fibrizo's ultimate goal wasn't achieved.
Seeing his failure, he thought of a new plan: He decided that he would use the power of the Lord of Nightmares, who he believed was a ma-ō even above his master, to return the world into chaos. However, as a mazoku he was unable to call upon her power directly, so he waited for a thousand years, until he found someone who could do this instead: Lina Inverse. Fibrizo used a diabolical plan involving the kidnapping and threatening the lives of her closest friends to force her into casting the Giga Slave spell. When he'd succeeded in getting her to cast it, he tried to annihilate her body so she would lose control of it, thus allowing the Lord of Nightmares' chaotic energy to roam freely. Ultimately, however, this plan proved to be his undoing, as he never expected that the Golden Lord would transfer into Lina's body in person. As he believed the Lord of Nightmares to be his ally, he didn't understand why she didn't start the apocalypse, and theorized that it was actually Lina who was holding her back, so he tried to destroy her body once again, this time with all his might. The Lord of Nightmares did not appreciate this at all, however, and made short work of him, thus, from his point of view, granting him the destruction of everything he so desperately wanted.
Fibrizo was proven to be very calculating, sinister and sadistic. He had a fascination with pain and destruction that, in human terms, would be considered borderline psychotic. The latter is is not particularly noteworthy as all mazoku instinctively possess a desire for destruction, but the objective of destroying the world was not just a goal for Fibrizo: he became completely obsessed with it and was shown to be absolutely exhilarated by its apparent success. However, once Hellmaster's plans had backfired with the appearance of the Lord of Nightmares, he had a breakdown and literally went mad. He is notably one of the most sadistic characters in the series, best illustrated by the act of killing all of Lina's friends one by one in front of her eyes in order to get her to cast the Giga Slave, all the while showing extreme pleasure and delight in her suffering.
In contrast to his powers and appearance, Fibrizo manifests as an adorable young boy in the novels and anime. Of course, this is all a scheme, matching his conniving personality. His appearance is very androgynous, which was played upon in the manga where instead of manifesting as an effeminate young boy, he kidnapped a young girl name Erina and took control of her body. His beast form, on the other hand is amorphous, with no anthropomorphic qualities.
Fibrizo is a high-ranking mazoku. He possesses all the typical powers of such a being, best illustrated by the way he "resurrected" Sairaag, recreating the city and its inhabitants as part of his physical projection. His title, Hellmaster, has a very literal meaning: Fibrizo has power over the souls of dead, and can take the life of any human just by crushing a small golden marble which represents that person's life essence. He has also demonstrated the ability to encase a living being's body in a crystal like substance - if that crystal were to break, the person would die. This power was replicated by a spell created by Rezo the Red Priest, although for much less lethal uses.