Purgatory is set soon after Mark's brutal battle with Conquest but ends soon before he even meets Thragg. This arc follows Invincible as he faces against the Warthbound Legion, an elite squad of Viltrumite warriors sent personality by Grand Regent Thragg himself after Conquest's very disappointing loss. The Legion, operating under Thragg’s orders, aims to break Mark and push him to his limits, leaving him questioning whether he can survive their relentless assaults.

The Wrathbound Legion is a formidable alliance of five full-blooded Viltrumites, forged through a shared history of brutal training and unwavering loyalty to one another. United under the unyielding command of General Maeve, the group exemplifies the perfect blend of strength, strategy, and sheer ferocity. Each member has honed their unique abilities, allowing them to function as a well-oiled machine on the battlefield while maintaining their individual identities. Their reputation strikes terror into the hearts of their enemies, as they operate under the ruthless authority of Thragg and are unafraid to unleash their wrath upon any who dare oppose them.

Together, the members of the Wrathbound Legion epitomize the power and tenacity of the Viltrumite race, bound by loyalty and driven by the singular goal of executing Thragg’s will. They are not just warriors; they are a force of nature, feared by all who stand in their way.