Lucifer was once a beautiful angel who defied God and fell from grace. Since then, they have become the ruler of all hell and have vowed to rule Hell and make it take over the world. Lucifer was approached in Hell by Morpheus, who was in search of his helm, which he suspected was in the possession of a demon, a suspicion confirmed true when Dream discovered his helm with Choronzon, who challenged Dream to a fight. Should Dream win, he would regain possession of his helm, but should he lose, he'd have to serve as Choronzon's slave in Hell for eternity. While Dream chose to represent himself, Choronzon chose Lucifer as his warrior. And so, Lucifer and Morpheus faced off in a battle of wit and wisdom, a battle that Dream ultimately won, forcing Choronzon to return the helm. Dream extended his gratitude to Lucifer for their honorableness, but Lucifer questioned why they should even allow Dream to leave, as he had no power in Hell. While that may have been true, dreams did have power in Hell, as Hell itself would have no power if those imprisoned were not able to dream of Heaven. Furious and humiliated, Lucifer vowed to destroy Dream one day. Lucifer received an unexpected visit from Lord Azazel, who came at the bidding of the assembled Lords of Hell for their shared goal to defeat Dream of the Endless. They wished to invade the Dreaming, but only at Lucifer's behest. From there, they intended to also take over the waking world and even the Silver City. Since they couldn't leave Hell, they sought to expand its borders until Hell was all there was. With the generals demanding action, Lucifer promised to act fast. While Lucifer and Mazikeen agreed that they were not to be trusted, they did in fact need to take action, something that would upset God and bring Morpheus to his knees. However, it was in this plotting that they realized how tired they were. They've been working since the birth of the universe, and can’t help but be tired. They have billions of souls, but it doesn’t matter if they have no need. So they called for Dream and asked for them to take up the throne. This meant him cutting their wings off. They cried as it happened, and were weakened for a time. But they eventually went to Earth, learning to start a new life. They use our, we, and us as their pronouns, but also use they/them when informal.