Nightbringer

  WARNING ! This page may contain  MAJOR SPOILERS . Read at your own risk.

Nightbringer is a demon that seems to have sent MC back to the past. He is supposedly the first demon to be born in the world. Nightbringer also is known by many other names.

Story
Note: this section may include spoilers

Main Story
Nightbringer is first mentioned in Lesson 8-16 (of Obey Me! Nightbringer!) by a human named Adam who possessed Mammon's body. Adam was searching for his lost love in the Devildom. But, he became lost in the darkness as the Devildom wasn't a place meant for humans. Adam ended up wandering around lost for a long time. For a while, he was unable to see or hear anything until he heard the sound of a trumpet one day. After the trumpet stopped playing, Nightbringer appeared in front of him. Adam begged Nightbringer to help him find his lost love, but Nightbringer replied that he was unable to do anything for Adam right now. But, he promised that there would be a person who would one day appear and be able to help him. Nightbringer then offered to bring Adam to the place where he would one day meet that person and Adam accepted his offer. He told Adam that this person would possess the ring of light that could open the gates of the Celestial Realm which would help him reunite with his lost love.

In Lesson 8-18, Adam states that Nightbringer left a message with him for MC stating that it wasn't time for them to return just yet. In Lesson 9-2, Solomon and MC speculated about whether the person who sent MC to the past was actually Nightbringer since he left them that message.

In Lesson 12-2, MC hears a voice speaking to them inside their mind after they become unconscious due to making a promise inside the Fountain of Knowledge area of the Reaper's Cave. At first MC is confused about who is speaking to them, but the voice identifies themself as Nightbringer. He states that it has been some time since he's been called by that name that though. Nightbringer tells MC that he brought them back to the past because it's the path to happiness and that it will lead MC to a place that will bring them more joy than any place. However, he refuses to elaborate on what kind of place that is as it will ruin the surprise if he tells MC before MC reaches that destination. When MC asks him what he wants in return, he tells MC that he just wants them to forge pacts with all 7 of the demon brothers. Then, he disappears while leaving these last few words: "The scales are tipping, moving far out of balance. Darkness will overflow its golden plate, covering all in shadow...Night will come to this world, and I will be the one to bring it."

In Lesson 22-6, Satan mentions that he found some information about Nightbringer in a book from the Celestial Realm. He tells MC that Nightbringer is called "the father of demons" in the Celestial Realm. The book also mentions that Nightbringer was apparently the first demon to be born into the world.