Dark Age is a 2019 science fiction novel by American author Pierce Brown; it is the second book of a tetralogy which continues the story of his Red Rising trilogy (2014–2016).

Darrow's team reaches Mercury after rescuing Orion from Atlas' capture, though Ajax kills Tongueless.

Lacking Apollonius' help, Atalantia agrees to Lysander, Diomedes and Seraphina's offer to ally the Dominion with the Society.

Atalantia's forces (including Lysander and Seraphina) assault Mercury, but Darrow has Orion create hypercanes against them.

Orion goes overboard, intending to devastate Mercury to doom the Society, so Darrow kills her.

Kalindora, Rhone and the Praetorians pledge allegiance to Lysander, making him a political threat.

Publius, a puppet of the Syndicate, blames Virginia, instigating a deadly lowColour riot that propels him to power.

Syndicate Queen Lilath kills Daxo and has Virginia, Sevro, Clown and Pebble captured.

Sefi's Obsidians capture Ephraim, Pax and Electra, killing the Syndicate's men who retrieved the trio from their crashed ship.

With Ephraim's guidance, Sefi's Obsidians capture Mars' helium mines from Quicksilver.

Fearing Volga's death, Ephraim escapes the Obsidians, taking Pax and Electra on Snowball.

Lysander kills Alexandar and leads Heliopolis' civilian rebellion, freeing prisoners-of-war including Kalindora and Rhone.

[2] The title of the second installment, Dark Age, was announced in February 2018 soon after the release of Iron Gold.

[3] Dark Age was released on July 30, 2019,[4] and debuted at #4 on The New York Times Best Seller list.