Princes of Abyss

Princes of Hell series is a group consists of the seven strongest Fallen Angel cards which are based on the "Princes of Hell" with the Seven Sins. They consisted three types at once, Fairy-Type, Fiend-Type, and with a third extra type which were unique for all of them. They are made up with various of Attributes and various effects, however, all of them share a same effect, which is immortality. They have the ability to evade destruction in certain circumstances, though the requirements are different for each card. Their second effect is unique for each of them, and the effect is greatly inspired by their sins which they possess. In English Version, they are named by their original name, while in Japanese Version, they are given the title "Fallen Angel". They are the sub-type of Fallen Angel of Yuri Fanon Card, and it's not to be confused with the original TCG / OCG Fallen Angel, since they have nothing to do with them.

History
There were once seven Princes of Heaven ruling part of the Heaven, greatly admired by others angels. Their ranks were on the same par with the mighty Seven Archangels. However, their sins slowly consumed them as they were seeking for more power. They formed a group, betrayed and attacked the God in order to seize the throne but utterly failed. As a result, they were banished and exiled from heaven with their underlings. Their soul were sent to the bottomless Hell to receive the judgement from the God of Hell. They tried to retaliate but their attempts vanished into thin air as their rival, The Seven Archangels prevent them to do so. All of the rebellious angels and the Seven Princes of Heaven were sealed inside their respective jars and burned in the Hellfire for eternity. After a thousand years passed, when they were going to vanish, they sold their own soul for reincarnations and their attempts succeeded. However, they were forced to reside in cards due to their weak body which require a considerable time for regeneration. They established a group, named as "Fallen Angel", with the objective of conquering the throne of Heaven from the mighty god, but not before they "revived" and escape from their respective cards.

Trivia

 * Princes of Hell is the counterpart of Seven Archangels.
 * Each group consists of Seven Members.