Season 5 Ep... - A Chance At A Happy Endinglucifer :

During the final battle, Michael stabs Chloe with a piece of Zadkiel’s staff. Because she realizes her guilt over Dan's death was a manipulation, she dies guilt-free and ascends to Heaven—the one place Lucifer is strictly banished from under threat of incineration.

Rather than killing Michael, Lucifer chooses to show mercy by cutting off Michael's wings, declaring that "everyone deserves a second chance".

about why Lucifer didn't actually burn in Heaven. Lucifer Season 5 Ending Explained - Den of Geek

The Lucifer Season 5 finale, is a pivotal episode that serves as the culmination of the series' primary conflict between Lucifer and his twin brother, Michael, over the vacancy of God's throne. Originally intended to be the series finale, it resolves major character arcs with high-stakes celestial warfare and the ultimate self-sacrifice. Plot Summary & Key Events

Michael attempts to coerce Lucifer into returning to Hell by revealing he orchestrated Dan Espinoza's death specifically to fill Chloe with enough guilt to send her to Hell, where she could be with Lucifer eternally.

Halfway through filming the episode, production was halted by the COVID-19 pandemic. Because the show was renewed for a sixth season after the script was written, the original planned ten-minute epilogue was removed to allow for the exploration of Lucifer’s new role as God in Season 6.