Light Bringer is a 2023 science fiction novel by American author Pierce Brown; it is the third book of a tetralogy which continues the story of his Red Rising trilogy (2014–2016).

Light Bringer takes place after the events of Dark Age (2019), as the survivors from Mercury make their way to Mars and the Solar Republic.

[1] After the Republic loses Mercury to the Society, Darrow and his remaining soldiers hide on the 'trash moon' Marcher-1682 for eight months.

They flee Venus with Aurae, who asks Sevro to lead the Rim's Daughters of Athena.

Lysander is celebrated as Mercury's ruler, but Atalantia orders him to Earth and captures his mentor, Gilrastes.

Lysander parleys with Virginia, who relinquishes Phobos for her forces' safe passage to Mars and a prisoner swap for Kavax and Cicero.

At Atlas' behest, Fá's Obsidians and Ascomanni attack the moons of Jupiter, drawing the Dominion's forces from Mars; a recuperating Lysander follows.

Quicksilver reveals that his fleet was transformed into a generation ship containing non-Color children to escape the solar system.

Sevro intervenes to have Darrow, Diomedes and Cassius spared to join the Daughters' fight against Fá.

Later, Cassius meets Lysander to propose killing Atlas, who returns after retrieving the biological weapon Eidmi, which can eliminate any selected Color on any planet.

The Republic, the Dominion, the Daughters and the Obsidians enter an uneasy alliance; their forces leave for Mars.

[4] According to Brian Kitson of The Cosmic Circus, if readers are "looking for another well-written science-fiction/fantasy novel on audio, then Light Bringer should definitely be on [their] list".