The school's quiet librarian discovered forbidden summoning rituals hidden in a donated collection of antique books, becoming obsessed with the power they promised. When prom night arrived, they used their access to school records and ancient knowledge to facilitate the demonic invasion, transforming from helpful keeper of books into a blasphemous cult leader who corrupts information itself.

Manifests as a Calavera skull wearing cracked reading glasses that reflect hellish flames, surrounded by floating books whose pages burn with demonic text that rewrites itself. Wears a torn formal vest over traditional librarian attire that has transformed into tattered cult robes, with a corsage made of thorned vines wrapped around ancient scrolls. The entity radiates an aura that causes written words to change meaning and corrupts any knowledge it touches.

Serves as a keeper and corruptor of forbidden knowledge, using their position of trust to recruit others into the demonic hierarchy through contaminated texts and falsified records. They maintain the supernatural bureaucracy of hell's invasion, ensuring that every soul claimed is properly documented in their blasphemous ledgers.