The Bound Instructor

Svællr, a masked demon lord, is captured and released only on the condition that he teaches at an Academy for Heroes. In a world of superpowers, Villains, and F through SSS rankings, the Academy gathers the country's five SS-ranked heroes as teachers. Only three SSS-ranked heroes exist worldwide, including the Principal and Svællr. Svællr possesses the Blessing of Baphomet, granting access to Baphomet's Arsenal, weapons created from fog in warm black metal with burnished bronze-gold accents. The series follows Svællr's life, lessons, and power struggles inside the Academy.