In the brutal, darkness-infested worlds of Nioh and Nioh 2 , survival depends on more than just quick reflexes and mastery of the katana. To truly conquer the hostile lands of Sengoku-era Japan—now overrun by vengeful spirits and demonic yokai —a player must become a scholar of the supernatural. This is where the Codex (often fully titled the Illustrated Codex or Yokai Illustrated in menus) becomes an indispensable tool.

Whether you are trying to remember how to defeat a , understand the tragic backstory of Oichi , or simply appreciate the art of a Kodama (the little forest spirits), the Codex is your constant companion. In the darkness of the Nioh universe, knowledge truly is the sharpest blade. “To know your enemy is the first step to cutting him down.” — Apropos of the Nioh Codex.

Nevertheless, Team Ninja deserves credit for avoiding the dreaded “unskippable tutorial” by hiding essential knowledge within an optional, beautifully illustrated compendium. The Nioh Codex is a testament to the game’s respect for both Japanese folklore and player intelligence. It acknowledges that a true samurai is not just a warrior, but also a poet, a historian, and a demonologist. By rewarding curiosity with tangible combat advantages, it transforms reading from a passive activity into an act of strategic preparation.