Blood, a skeletal undead warrior, serves as both guardian and mentor to William. Once a legendary human fighter called the War Ogre, he forged a pact with Stagnate, god of undeath, to resurrect as an eternal sentinel. Bound by duty to protect the Demon High King’s seal alongside fellow guardians Mary and Augustus—a consequence of their shared failure to vanquish the entity in life—he wields his skeletal frame with undiminished combat skill, marked by flowing red hair and piercing azure will-o’-wisp eyes. A fervent advocate of brute strength, Blood drills William in merciless swordsmanship, believing survival hinges on unrelenting force. His hot-blooded zeal for battle masks centuries-old wisdom, tempered by undying regret. Though playful in his rivalry with Augustus, frequently gambling to lighten their grim vigil, he shields William from harsh truths about their undead bondage and past defeats, prioritizing the youth’s safety over transparency. The contract granting his resurrection tethers his soul to Stagnate’s will, a debt that manifests when the god’s echo demands their souls post-guardianship. This confrontation spurs William to wield the demonblade Overeater, severing their bonds in a climactic duel shaped by Blood’s teachings. His legacy endures in William’s relentless combat style and uncompromising resilience. Subtler facets reveal his history: tactical ingenuity honed as a disciple of Blaze, god of fire and technology, and unorthodox strategies like baiting foes to impale him, exploiting his skeletal form to disarm them. His dynamic with Mary and Augustus mirrors their tangled past—a trio of fallen heroes clinging to redemption by molding William into the warrior they once aspired to be.