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 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.

Knowing that the Titanstone Knuckles are in the city of Westruun, Pike and Scanlan come up with a plan to get them from their current owner, Grog's uncle, Kevdak. But Grog, weakened by Craven Edge's curse and haunted by his last encounter with his uncle, questions whether he is strong enough of mind, or body, to confront Kevdak.

In disguise, Raishan visits Vox Machina with a promise of aid. She tells them of a vestige capable of defeating Thordak; the Plate of the Dawnmartyr. The team is divided on trusting the duplicitous dragon, but journeys to the city of Marquet to test if she speaks true.

While Vax, Keyleth, Pike, Grog and Scanlan seek magical armor in the Hells of Despath, Percy, Vex, Kima and Allura try to survive against the savage Vorugal. Can each team survive the fires of hell, and the frigid doom?