Black Rose

The Black Rose (黒くろ キ 薔薇ばら) is a legendary phenomenon that is considered dangerous because it once destroyed the Oriana Kingdom, but the true identity of Black Rose is a portal to another world.

Overview
The Black Rose is a gateway that facilitates the connection between two worlds, allowing them to collide and become intertwined, thereby enabling each world to exert influence upon the other.

Background
Legend has it that it was used by the Oriana Kingdom, which was on the brink of extinction due to the Velgalta Empire's invasion and wiped out 100,000 soldiers in one night. However, the real story is that the Black Rose By mere coincidence it was opened, which open the gate that connects the demon world, And the other worlds, like the one Cid lives in now, the reason why 100,000 Vegalta soldiers were annihilated was because monsters flowed from the demon world through Black Rose and attacked the Vegalta soldiers. However, after a short time, the monsters also began to attack the Kingdom of Oriana, so if nothing was done, it would be its inevitable destruction.

During the destruction of the kingdom of Oriana, the demon King called Ragnarok appeared, which is the demon that reigned over the fourth infernal world, of demons, for which reason, he was classified as an existence, practically as dangerous, as the demon king Diabolos.

But the agitation ended the Cult of Diablos, he decided to intervene in closing the door "the so-called Black Rose", achieving in the process, repel the demon Ragnarok in the process of closing the Black Rose, with the aim of taking advantage of the foundations of the kingdom of Oriana, and obtaining a pawn country under his command.

With the Cult stewardship of the "Black Rose" to ensured that the Kingdom would survive in perpetuity, they decide to make a pact with the Kingdom to give the Cult a fair compensation, which is the Royal Blood and the majority of the Kingdom's tax revenue will be given to the Cult, resulting in the Kingdom to heavily invest on the arts was so it could entertain them. Also, the Cult are manipulating the Church to persecuted Dark Knights as a way for the Cult to prevent Oriana from gaining the strength and no manpower to rebel against the Cult, which basically became a puppet kingdom.

investigation of Mr. Laugus
TBA

Oriana's "Black Rose" Civil War Wedding Incident
TBA

Return to Earth
TBA

Trivia

 * In the Light Novel, Black Rose is referred to as a catastrophe. While in the Web Novel, Black Rose is referred to as a symbol of justice for the Oriana Kingdom.
 * Cid Kagenō tries to make an imitation of Black Rose by releasing his magic into the night sky that looks exactly like Black Rose, when Cid is with the "Vow of Black Rose" troop.
 * It appears that in one episode of the anime, there is an easter egg about the Web Novel Black Rose story.
 * According to Mordred, despite the Cult of Diablos holding ownership of the Black Rose, their authority over it remains limited, primarily because they lack precise control over the specific demon world to which the gate connects.