Official Modding Guides from Flaming Fowl Studios allow players to download instructions for creating custom scenarios, rooms, and monster spawners.
For players using the digital version or looking to customize their experience, various "codex-like" files and tools are available: download-gloomhaven-codex
A comprehensive campaign helper tool available as an Electron application for Windows, Mac, and Linux. It assists with tracking character progression and scenario data. Official Modding Guides from Flaming Fowl Studios allow
You can often find text-only drafts or early versions of the Gloomhaven RPG Rules on community forums like RPG.net, which provide insights into monster threat levels and "nemesis" (boss) construction. Digital Assets & Modding Tools download-gloomhaven-codex