Blaze Black Flare

The Blaze Black Flare, also known as the Evil Dragon's Black Flame is a Sacred Gear wielded by Genshirou Saji of the Student Council and the pawn of Sona Sitri.

It holds a part of Prison Dragon Vritra's soul and one out of the four Vritra-type Sacred Gears that Saji owns.

Summary
At some point, Grigori had previously retrieved Vritra type Sacred Gears such as Blaze Black Flare.

It first appeared in Volume 7 of the Light Novels, when Grigori implanted it and other Vritra Sacred Gears into Saji during the final battle against Loki, where Saji used it in tandem with his other Sacred Gears to restrain Loki for Issei to strike him.

In Volume 17, Saji achieved his Balance Breaker as a result of the combination of the four Vritra Sacred Gears and the fusion of Saji and Vritra, all while he fought against Walburga where the two clashed with each others respected flames

Appearance
The fire it generates is seen as jet-black in color. In the anime, it's shown to also have a hint of purple mix into it

Abilities
Blaze Black Flare gives the user access and control over Vritra's intensive jet-black colored flames that are equivalent to hell-fire. The Sacred Gear can also be used to create a barrier made of fire. Moreover, the user is able to use these black flames to shoot out a breath of fire.

The flames themselves are able to curse the soul of any being caught and killed by them for eternity, with the user being the only exception as it grants it immunity over them since they can be used cover the wielder for protection. The curse properties of these flames are nearly enough to counter the pure attribute of the Holy fires of Incinerate Anthem to a certain degree.

When used with Absorption Line, the flames can be transferred only its lines towards its restrained targets.

Malebolge Vritra Promotion
Malebolge Vritra Promotion, also known as the Dragon King's Flame Prison of Guilt, is Saji's combined Balance Breaker of Blaze Black Flare with the rest of his Vritra's Sacred Gears which creates a Jet-Black Dragon Armor that strengthens the users powers and abilities. The jet-black flames are strengthened to actually go on par with the Holy flames of Incinerate Anthem. The user can now inflict multiple curses onto other beings, it's noted that it will curse anyone to death if approached carelessly.