Black Altar Avid

At first glance, Avido bears a strong resemblance to Hakurei from the altar when he was young, although what differentiates him from the latter is that Avido has a scar that runs vertically through his right eye and another diagonal scar on his right cheek, forming a kind of X. His clothing consists of a black trench coat in which he hides his dark cloth.

Avido like any renegade saint is a person who only follows his own ambitions, such is his ambition that he not only had wealth like gold but also had souls since according to him it was wealth of the dead, Avido is someone who follows his convictions to the end, that was seen when he met his former master Hakurei telling him that if he were reborn he would do the same thing over and over again, he has no appreciation for human life, an example is that he sees his subordinates as simple disposable tools.

Avid was the student of Hakurei del Altar, however he was banished to Death Queen, where he remained for an indeterminate time, along with a group of Black Saints they murdered the guardian of the island and his family, Yudo was responsible for most of this massacre, then they escaped from Death Queen and settled in Venice giving rise to the criminal organization Nero. He arrives at the Sanctuary when Hakurei del Altar comes to meet the new Athena. Avid arrives to make his position as Leader of the Black Saints recognized, after speaking with his teacher he escapes from the Sanctuary leaving Hakurei and Sage worried. then reappears talking to Yudo and Laimargos About Alegre, After the Battle of Rusé against Albafica, Avid executes his subordinate.
Later he is seen talking with Manigoldo. He has a tough battle against Manigoldo, then says that Manigoldo does not have enough power to uproot so many souls. And what's more, this place is filled with Ávido's Cosmos, something so basic would not work for him, when the Black Saint decides to have a little more fun with Manigoldo, the Black Saint summons the Black Cloth of Ara after donning his Black Cloth. Ávido and Manigoldo begin to talk about their masters Sage and Hakurei respectively. Ávido and Manigoldo continue their battle, where the Gold Saint hears the wails of the souls. The Black Saint grabs Manigoldo by the hair saying that he was going to cut off his head and send it to the Sanctuary. since it would put on a show, at that moment Ávido laughed however, Manigoldo also laughed in his face saying that he would like to see Sage and Hakurei's faces at that moment, after talking to Manigoldo, Ávido continues to resist, but the Gold Saint takes charge and frees all the souls. The mansion begins to disappear. Ávido collapses with his eyes completely white.

Then his soul is found on Yomotsu Hill where he meets his master with whom he talks about the path that Ávido has chosen, then Manigoldo and Gioca appear before him, at that moment Ávido is stopped by the Souls of all those he killed to fulfill his ambitions, quickly the Black Saint burns them, then Manigoldo throws him into the well on said hill, while Ávido falls he confesses his true desires and prepares to have fun in the Underworld.

•Seki Shiki Meikai Ha: Concentrates his cosmos on the tip of his right index finger, from which a white aura emanates, then sends out a spiral wave of radiation in the form of white rings that expand and coil around the opponent's body to separate the soul from the body and suck it towards the realm of the dead.
•Seki Shiki Nyoi Reirin: The user manipulates souls and converts them into showers of large energy beams.
•Seki Shiki Meikai No Nami: Her index finger fills with spiritual energy and launches several souls that explode around the enemy, destroying the place.
•Doku Praesepe: This consists of launching a cloud of toxic gas and using it to poison the opponent in such a way that when touched directly, they become slow for a few moments.
•Seki Shiki Meihitsugi Ha: Concentrates his cosmos into his right index finger, sending a spirit that rapidly shoots toward the opponent, who is then immobilized by other spirits. The user then clenches his fist, causing these spirits to cause great damage, even capable of destroying the opponent's armor.
•Seki Shiki Meiki Meido Chōraku: He uses the bodies of the people he has killed, as is the case he calls "puppets", to trap his opponents, leaving them immobile and then causing them to fall violently to the ground.
•Sekishiki Kisōen: Uses the blue and white will-o'-the-wisps of Yomotsu Hirasaka which do not produce heat but burn as long as they feed on the soul of their target, incinerating it.
•Seki Shiki Konsō Ha: The user attracts and uses the lost souls near the palm of the hand and when he obtains enough energy, he uses them as gunpowder to produce a great explosion, and when he obtains enough energy he launches a kind of luminous ray that acts as fuel to generate a terrible explosion, and that when in contact with fire it explodes, with this method he makes souls explode to hurt his opponent.