Diehauser Belial's Peerage

Diehauser Belial's Peerage First appears in Life 3 when Ichiro promises to ruin Diehauser because he was the one who gave Ichiro to Amelia. Being one of the few devils with a full set peerage, he also dominates the Rating Game being ranked 1 due to being stronger than all other Rating Game participants and maintaining the most wins on record which is why he’s known by the name Emperor. Everyone in Diehauser's peerage is a high-class devil and has their own evil piece sets although his Queen Diana doesn't use her.

Diehauser Belial
The ranked 1 Emperor of the Rating Games and one of the strongest devils in existence, being a Ultimate-Class Devil. He is a master at using his family's worthless ability and possess Immense Strength, Speed, Durability, and is a master at hand-to-hand combat. Because he was the one who gave Ichiro to Amelia, Ichiro reveals that he hates him and wants to ruin his life.

Diana Marbas (Queen)
Diana is the Queen of Diehauser and is the strongest member of his peerage along with being one of the strongest Queen in the Underworld behind Grayfia Lucifuge and a few others. She witnessed her clan's destruction during the Great War and decided to become Diehauser's queen in order to gain political power. She is smart, good at calculation, and battle strategies. Her clan ability is known as "Power over Death" which allows her to use necromancy to bring back dead bodies as puppets to fight on her behalf. The corpses she brings back are limited to those she killed personally and despite the fact that they are able to use the abilities minus those of sacred gears and battle strategies they shared while alive they are shown to be mindless and unable to think and talk because the soul of the corpse is gone. She is also able to summon the clan’s magical white flames and white lighting. It is revealed that she is in love with her King.

Elizabeth Cimerius (rook)
The second pure blooded devil of Diehauser's peerage, a girl from the extinct Cimerius Clan. She works under Ajuka Beelzebub as an Underworld scientist. She is known as the third strongest rook in the Underworld possessing immense strength and durability befitting of a rook. She also possess the Cimerius clan's ability to tame Hell-beasts, she possess two powerful Hell-beasts known as Ox-Head and '''Horse-Face '''along with a pack of nine hellhounds.