Assassin's Creed Valhalla: The Hidden Codex

After securing his own freedom from a clan of Vikings that kidnapped him, Edward, a scribe and reluctant monk, returns to find his brother missing and strange documents blackened by a language he innately understands.

No one knows where these occult-looking symbols came from, but Edward has seen such writings before: in the workshop of an enigmatic wise man among the Vikings who is part of a secret order: Those Unseen. An order that could offer answers to Edward, and guarantee his aspirations of freedom and knowledge. But with that knowledge can he find and rescue his own brother before it's too late?