I got the chance to run this dungeon for my main group earlier this week as part of getting the hang of their abilities and system rules for our upcoming Quest campaign. I found it while flipping through the One Pace Dungeon compendium. Between the gorgeous map and the evocative details in the key, it was a delight to pull out of my back pocket with functionally no prep, and it would easily slot into pretty much any fantasy adventure rpg. My group ended up throwing the evil tome into a mine cart with some dynamite and pushing it away down the track in the middle of their final confrontation, which led to a huge explosion and a great climax! Thank you so much for your work on this!