A final chance for atonement.

In Hollow City, chaos brews, thickening from the uncertainty of the Himura demigod. Division begins to form between the deities while the witches grow restless, eager to get their hands on a god-killing weapon.

After the tragic end of Ruelle, The High God of Chaos and Ruin is hungry for vengeance. Disgusted by the Council and their decision to protect the Himura demigod, Acacius disregards his responsibilities, setting his sights on the goddess who used and betrayed him.

The High Goddess of Night has lost everything she holds close. Swimming in a spiral of grief, Marina's will to carry on declines each day, but a single thing pushes her forward: a promise she swore she would uphold to someone she loves.

Acacius unleashes a deluge of ruin upon Marina for her betrayal. Everything she cares for—her pride, her village, her title—he intends to destroy. Though, their back-and-forth war of calamity and resentment quickly evolves into unexpected attraction. The more Acacius mends her umbral heart, the quicker Marina must decide which is more important: her secret vow, or her incendiary love.