In Episode "A Chance at a Happy Ending", with Michael on his way to becoming the new God, he offers Lucifer a chance to become King of Hell again and Chloe will also go to hell to be Lucifer's bride.

@Lucifer | The episode is shown on Netflix or as per the movie link near the bottom of the article.

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MICHAEL'S PLOT TO BANISH CHLOE TO HELL

To do this, Michael masterminded Dan to be killed in the previous episode, while manipulating his soul to be banished to hell instead of going to heaven.

Because of Dan's death in the case in charge of Chloe, she will be sentenced to hell. When this truth is revealed, Chloe is even more motivated to help Lucifer in the fight against Michael.

TEAM MICHAEL AND TEAM LUCIFER

Michael kills Remiel and collects the last piece of the Flaming Sword. Lucifer, Amenadiel, Chloe, Eve, Maze, and several demons (summoned by Maze) face off against Michael and the angels at the Los Angeles Memorial Arena to vote on who will be the new God. After convincing, Angel Zadkiel (Joel Rush) and another female angel switch to Lucifer's side.

At the beginning of the duel, Lucifer suggests that the winner be God, the loser to hell; but Michael proposes that the loser must be perished by the blade of death; and Lucifer agrees.

MICHAEL – LUCIFER FIGHT

Machael activates the Flaming Sword and easily overpower the empty-handed Lucifer. Amendadiel then borrows the Staff made from Tree of Life from Zadkiel and throws it to Lucifer as a weapon. The wooden weapon helps to balance the fight, but in the end Michael cuts the stick in half with his sword.

As Lucifer and Michael wrestle to take the Flaming Sword, Chloe appears and pulls the key from the sword, causing it to revert back to the form of a death knife. Michael chases after Chloe to get the key back and fatally stabs her with the half of the broken staff.

As she is dying, Chloe tells Lucifer that she knew Dan's death was not her fault. Relieved of guilt, she is sent to Heaven instead of Hell against Michael's plot.

Not wanting to lose Chloe, Lucifer flys to Heaven to save her. Lucifer is forbidden in this place, so he would have been destroyed if it weren't for Lilith's ring of immortality. Lucifer is able to reach Chloe and gives her the ring so she could resurrect in the mortal world. This means Lucifer will die.

NEW GOD OF HEAVEN CLAIMED

In the mortal world, Chloe revives and uses her superhuman strength given by the key in her hand to beat Michael to submission. She takes the blade of death to kill Michael when Lucifer suddenly returns in good shape and tell her to stop.

Instead of executing his brother as a pre-war deal, Lucifer choses to cut off Michael's wings to give him a second chance on Earth.

Lucifer's selfless sacrifice makes him the new God with the Flaming Sword in hand, and all the angels gather to kneel before him.