House Leviathan

House Lucifer (ハウス・ルシファー Hausu Rushifā) is one of the oldest and most powerful Noble Houses in the Underworld and the current Royal Family. It's current head is Azazel Lucifer, the current Demon King (魔王 Maō).

Overview
Members of House Lucifer have been typically distinguished by their silver hair, red eyes and immensely powerful demonic aura. They, like other noble's, have a low opinion of lesser-ranked demon's and humans, however most members are unconcerned with the affairs of said lesser beings. They have a strong affinity for fire and are extremely resistant to heat, though not completely immune.

In order to keep the family "pure", they practiced inbreeding until Azazel outlawed incest, partly because their was supposedly evidence suggesting that generations of inbreeding resulted in a less than favourable neurological disease but also because of the negative reaction of other noble houses.

In the past House Lucifer had a reputation for being extremely brutal and bloodthirsty, this (along with the incest and status as monarchs) put them in a precarious position and they are currently working to replenish their image in the eyes of their subjects.

Polyamorous marriage was also quite common, though it is still fairly common in the Underworld amongst nobles, just not currently in House Lucifer.

History
One of the oldest families in history, House Lucifer has existed since the founding of the Grigori. Durante Lucifer, infamously known as Dante the Inferno, was the founder of House Lucifer and perhaps the most famous demon of all time.

Amon Lucifer, known as Amon the Conqueror, established the.

At least fifty years before the current timeline, Azazel Lucifer one of Durante's descendants assumed the throne after his father, Bael Lucifer, died from injuries sustained during the Great Civil War, druing which several Great Houses attempted to seize the throne for themselves. Instead of following the traditional approach of marrying within the family, Azazel would go on to marry Silene Leviathan, of House Leviathan, forging a concrete alliance between two of the most powerful noble families in Hell. However this tradition of inbreeding did not die with Bael as Azazel and his older sister, Sariel, are revealed to have a longstanding but secret incestuous relationship and it is possible that any one of the current five children of House Lucifer are the product of this relationship.

Power & Influence
As the current and founding royal family, House Lucifer has the most power out of all of the current Great Houses.

Not only do House Lucifer have vast armies at their disposal but they are also known widely for producing some of the most powerful Demon's of all time. Azazel and Silene's eldest child, Seraphim, is revered as one of the three strongest demon's in the Underworld.

Trivia

 * The element that House Leviathan is associated with is water.