Malebranche

Malebranche are 12 living weapons, currently in the Form of Stone Statues, created by the original Four Great Satans through crystals excavated from Agreas and were modeled using Sacred Gears as a reference. They're considered the Devil's version of Sacred Gears. Due to their ability to transform themselves into weapons, the original Satans also referred the Malebranche as "Satanic Arms".

Summary
The original Four Great Satans created and used them secretly as living weapons, but later feared their devastating power and were sealed away. They weren't used in the Great War because even if the Devils were to win, they believed that the Malebranche would later kill them in their sleep. The Original Satans described them as "extremely crazed combatants".

Information about the Malebranche isn't revealed to the public, so the Devils only hear about them as legends. Only the Original Satans and the heads of the Six Houses of Lucifer knew they truly existed. Lord Zaoroma Nebiros is currently the only one left aware of them, as all others who did know about them have died.

Considered living weapons, the Malebranche have both body and consciousness and can change between their normal form or into combat gear to be wielded.

Barbariccia and Scarmiglione were partially unsealed during the Devil Civil War, with Barbariccia felt uninterested in that era and instead wished to fight against the Longinus and their wielders instead.

They were sealed away in the deepest space below Lucifaad, but at the end of the Civil War were moved to Zaoroma Nebiros' underground research lab with the intention to be unsealed when all the Longinus possessors have assembled.

Members
All members of the Malebranche are currently sealed away with documents left by the original Satans saying that "only the leader, Malacoda, must never be awakened".

Known Member of the Malebranche are:

Appearance
As they are currently sealed away, they are described as 12 Stone Statues.

Abilities
While sealed away as statues, each member of the Malebranche releases an "indescribable pressure and indefinitely daunting aura" with Malacoda emitting "an aura far deadlier than all the other statues."

The Malebranche can transform between their normal form or into combat gear to be used by the wearer. Their powers were so great that even the original Four Great Satans feared them.

They can transfer part of their power to another Devil, boasting their power dependent of the compatibility and with different effects.

Scarmiglione gave a Unnamed Beelzebub a small amount of his power as a demonstration of what the Malebranche are capable of. The Beelzebub-Descendant transformed into a gigantic Fly Chimera which could disperse a deadly Poison from his Body and became intoxicated by the power given to him'''. '''He became so dangerous that Sirzechs Gremory needed to go into his true Form and use "Ruin the Extinct" to completely annihilate him.

Trivia

 * The Information about the Malebranche are from the "High School DxD Zero" Light Novel
 * Malacoda, Barbariccia and Scarmiglione are named or play a Role in "High School DxD Zero"
 * They're alternate names the Maou called them were "Maou Weapons" (Satanic Arms) Evil Claws(悪の爪) [Malebranche（マレブランケ)] Maou Weapons(魔王兵器) [Satanic Arms (サタニック・アームズ)]
 * The Kanji used for Malebranche translates to "Evil Claws" and the Kanji used for Satanic Arms translates to "Maou Weapons".
 * The Malebranche ( Italian:  [ˌmaleˈbraŋke]; "Evil Claws")[1] are the demons in the Inferno of Dante's Divine Comedy who guard Bolgia Five of the Eighth Circle (Malebolge).
 * The Names outside of the three that are in the DxD Zero LN are taken from the Wikipedia Entry Malebranche and are: Alichino, Cagnazzo, Calcabrina, Ciriatto, Draghignazzo, Farfarello, Graffiacane, Libicocco, Rubicante