v1.3.1 is a release file of the Minecraft map Protectors of Myrunir, made for Minecraft 1.18.1, 1.18.2. It was published on June 6, 2022 and is 57 MB in size. For the full description, screenshots and every other version, visit the Protectors of Myrunir map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.