After defeating the Obsidian Butterfly, Leonora carries the title of Godslayer. Peace in Mexico City is fragile. Rebellion brews in the North, and when the people’s safety is at risk, Pantera must once again become the demure viceregent Leonora to stop a war before it begins. But her friends are scattered, Tezca is gone, and one wrong move could seal her fate. Caution is her ally, for the real Prince of Asturias --- her former betrothed --- has arrived at court, reigniting rumors that Leonora and Pantera are one. A greater threat looms in the mountains, where a false king seeks to summon the god of night using a weapon of untold power. It’s up to the Godslayer to confront this enemy…and the one growing within her. Only by embracing her divine origins can Leonora triumph over the forces of darkness --- and maybe even spark a revolution that could change Mexico’s fate forever.

In 16th-century New Spain, witchcraft is punishable by death, indigenous temples have been destroyed, and tales of mythical creatures that once roamed the land have become whispers in the night. Hidden behind a mask, Pantera uses her magic and legendary swordplay skills to fight the tyranny of Spanish rule. To all who know her, Leonora de las Casas Tlazohtzin never leaves the palace and is promised to the heir of the Spanish throne. The respectable, law-abiding Lady Leonora faints at the sight of blood and would rather be caught dead than meddle in court affairs. No one suspects that Leonora and Pantera are the same person. When an ancient prophecy of destruction threatens to come true, Leonora --- and therefore Pantera --- is forced to decide: surrender the mask or fight to the end.