Clerics of the Seven Luminaries

Clerics of the Seven Luminaries (七曜の老師) or Seven Luminaries (七曜) for short, were the highest consultants of the Western Holy Church.

Background
Each one of them had strength surpassing the average Enlightened. They were legendary figures who had even trained Heroes in the past. They completely masked their presence from the public eye and became legends that were only said to live in fairy tales.

There is only a small group of people who have actually witnessed them, even among the Western Holy Church, only a few high-ranking officials have had the opportunity to meet them.

The "Trials of Seven Luminaries" that Hinata once went through were created by them. It was a trial used to select Champions and Heroes.

They were responsible for overseeing different organizations and training new knights. All of these assignments were given by Luminous. And before Hinata came into her position, the Crusaders was an organization with only their name but nothing to back it up, due to them secretly sabotaging potential talents.

The Seven Luminaries were actually strong Humans who had received Luminous' blessing and were given a long lifespan in exchange for their services.

Chronology
Because they feared that the Priest Adalman and Acolyte Albert would surpass them, they sent them to their death to face a Death Dragon.

They also tried to pit Hinata Sakaguchi against Demon Lord Rimuru, as they were afraid of losing Luminous' favor.

They met their end when they were killed by Nikolaus, Diablo, and Luminous herself, after their plot to eradicate both Hinata and Rimuru was exposed.

Trivia

 * The Clerics of the Seven Luminaries are one of the most significantly changed group of characters between the Web Novel and Light Novel. In the Web Novel, they are a group of Vampire Nobles serving Luminous loyally and didn't contribute much to the story, unlike the evil masterminds depicted in the Light Novel.