The ragtag group of adventurers known as Vox Machina are commissioned by Sovereign Uriel to find out who (or what) is decimating villages in the outskirts of Emon.

Vox Machina tells Sovereign Uriel of the monstrous culprit behind the devastating village attacks, and manage to track the creature back to its hidden lair. For the safety of Emon, Vox Machina must rise to the occasion and go face-to-face with a beast that is seemingly impossible to kill.

Vox Machina is invited to the palace for a formal dinner, where Percy encounters murderous figures from his past: the mysterious Lord Sylas and Lady Delilah Briarwood. While gathering more information about the Briarwoods, a battle ensues. In the aftermath, the team discovers Percy’s tortured past has left something dark brewing inside of him.

Vox Machina journeys to Whitestone to confront the Briarwoods and help Percy reclaim his family home. As they travel, Scanlan studies Delilah Briarwood’s mysterious spell book to uncover clues. But the team’s first road trip is interrupted when the Briarwoods send horrific monsters to retrieve their missing book.

Vox Machina finds Whitestone's holy leader, Keeper Yennen, who tells them of a growing rebellion. The team realizes that to defeat the Briarwoods they will need the help of rebel leader, Archibald Desnay. But first they must stage a daring prison break and confront the Briarwoods’ sadistic jailer, Kerrion Stonefell.

As Vox Machina discovers more about a revenge pact Percy made years ago, Keyleth tries to magically connect with the Sun Tree. She senses its pain as well as a dark force deep below the city of Whitestone. Feeling underappreciated, Scanlan volunteers to infiltrate Duke Vedmire's mansion as a distraction while Vox Machina attempts to rescue Percy's sister Cassandra.

Vox Machina battles the vicious Professor Anders and his unique magical abilities, while Delilah Briarwood uses magic to summon a demonic army to rise against our heroes. Meanwhile, Pike searches for a way to reconnect with her deity, even if it means risking her life.

The Briarwoods' evil past connects with the present as Delilah reveals her pact with the Whispered One. In the bloody Whitestone streets, Vox Machina wages the fight of their lives against an undead horde. But just when all looks lost, the team gets help from an unexpected source.

After Percy confronts his old nemesis, Dr. Anna Ripley, a tenuous partnership is struck. Despite Percy’s protests that she can’t be trusted, Vox Machina brings Ripley along. She leads them through the traps under the castle, but soon the team is double-crossed by one of their own.

Vox Machina launches a final assault against the Briarwoods atop the Ziggurat. Battling the dark magic of Delilah and the vampiric strength of Sylas, a worried Vex and an unhinged Percy try to save their siblings. But their best efforts may not be enough as the Briarwoods near completion of their secret ritual.

Vox Machina has stopped the Briarwoods’ evil ritual, but at a heavy cost. As they flee the Ziggurat to save one of their own, Percy is eager to take revenge on their prisoner, Delilah Briarwood. When Vex implores him to let go of his vengeance, Percy must confront the darkness within himself.