For players unfamiliar with the Sengoku period, the Codex serves as a crash course, helping them appreciate why the Battle of Sekigahara matters or who the mysterious “Mumyo” (Nameless) really is.
Each yokai entry begins with a narrative passage written in an archaic, almost academic tone. For example, the entry for the (a usually mischievous river creature) explains its love of cucumbers and weakness for bowing—a trait faithfully translated into the game. The Yuki-onna (Snow Woman) entry recounts the tragic tale of a spirit who freezes lost travelers, mirroring her ice-based attacks. This turns the Codex into a miniature encyclopedia of Japanese supernatural lore, often citing regional legends or classical kaidan (ghost stories). nioh codex
Given Nioh's status as a loot-heavy Action RPG, the Codex tracks the vast arsenal available to the player. For players unfamiliar with the Sengoku period, the