🧩 Mods Guide

On 2026-07-07, NPC Studio migrated Fields of Mistria to a new engine in preparation for 1.0. MOMI's official README states it plainly: "Because of the engine change that happened on July 7th 2026, all mods made before the engine change will be outdated and won't be supported anymore. As a rule of thumb, all mods that have been released before July 2026 will need to be updated." MOMI itself has been updated (v0.14.3 and v0.15.0 Beta), and mod authors are batch-updating — the community is in a post-1.0 rebuilding phase.

• Only download mods whose "Last updated" date on Nexus is after July 2026.
• Re-run MOMI after every game update to reinstall mods.
• If a mod hasn't been updated since early 2026 or before, assume it is broken and skip it.

💡 The "Last updated" date on a Nexus Mods page is your single most important filter — check it before every download.

MOMI (Mods of Mistria Installer) by Garethp is the de-facto standard mod installer for Fields of Mistria. It handles mod load order, conflict resolution, and re-application after game updates. Since v0.14.3 it also bundles MMAPI — a GML (GameMaker Language) modding framework that lets modders write code mods, not just asset replacements.

💡 MMAPI is the gateway to code mods — if you want to develop, start from the MMAPI releases on GitHub.

The MOMI workflow is consistent across mods. The single most important step is the first one.

• Back up your save (at %LocalAppData%\FieldsOfMistria\saves) — always, no exceptions.
• In the Fields of Mistria game folder (next to FieldsOfMistria.exe / data.win), create a mods folder.
• Download MOMI and your chosen mods from Nexus Mods (confirm each is updated post-July 2026).
• Unzip each mod .zip into the mods folder and delete the .zip.
• Run MOMI → check the mods you want → click Install.
• Launch the game.
• After every game update, re-run MOMI to reinstall mods.

💡 If MOMI can't find the game: place MOMI inside the game folder next to Maybe.toml. If something breaks: MOMI → Uninstall All → Steam Verify Integrity → MOMI reinstall — repeat twice, then ask on the FoM Discord if it still fails.

Nexus Mods requires a free account; Premium is optional and only speeds up downloads.

The categories below are drawn from IGN's 1.0 mods roundup, Nexus trending, and Sarah's Cozy Life. Every entry listed is reported to work post-engine-change; always double-check the "Last updated" date on Nexus before installing.

💡 Start small: install a QoL mod or two, play a few days, then add more. That way you know what broke when something breaks.

💡 The iron rule: back up .sav before installing any mod; treat cosmetic mods as "once in, stay in" for that save.

NPC Studio released vaultc — an official save unpack/repack tool on GitHub. It is the most "legit" way to modify game data (money, items, buff durations, etc.) without a mod. It is covered in depth in our Cheats & Save Editing Guide; mentioned here because it is the official channel that signals NPC Studio's attitude toward save modding.

• unpack a .sav into JSON, edit, repack — no hex editing needed.
• The official note reads "no warranty, use at your own risk" — modified saves are on you.
• For save editing details, see our Cheats & Save Editing Guide.

NPC Studio has not opposed modding — the evidence points the other way:

• They released vaultc (a save unpack/repack tool) specifically to make save editing easier.
• Wikipedia notes the game "supports modding, including changing villager appearances."
• FoM is a single-player game with no anti-cheat; mods affect only your own save.
• They have not published an official modding API or integration — that gap is filled entirely by community tools (MOMI, MMAPI).

💡 Mods live in a grey zone NPC Studio tolerates rather than endorses: no official API, but also no opposition, and an official save tool that makes the whole ecosystem easier.