FETH Overlay

Note

Based on feth-overlays by 3096, with contributions from Jacien.

An in-game overlay for Fire Emblem: Three Houses v1.2.0. Edit money, renown, items, classes, support points, and battalions from a single menu.

English, Simplified Chinese, Traditional Chinese, Japanese, and Korean are supported. The language follows your console by default; choose Language in the main menu to override it. Your language choice is remembered between sessions.

Features

Menu	Features
Resources	Edit money and renown.
Item Trainer	Restore normal durability, top up owned supplies, or fill a supply category to 99.
Class Unlocks	Unlock individual classes or all eligible classes for a character, filtered by starting class, gender, and exclusive roles.
Support Edit	Change support ranks within each pair's limits, or max all supports for a character.
Battalion Edit	Refill endurance, max levels, or add missing battalion types.

Refill All Durability restores Convoy and character-held items to each item's normal maximum durability.

Amount to 99 tops up owned supplies in the categories below. Missing items stay missing, and zero quantities stay zero. Weapons, equipment, lost items, and other quest items are unchanged.

Each category button sets every included type to 99, adding missing supplies. Repeated clicks keep the quantity at 99:

• Potions, exam seals, keys, stat boosters, forge materials, and gold bars.
• Gifts (including flowers), tea, bait, seeds, and ingredients.
• Trade Secret (Anna's quest item).

Class Unlocks shows each character's eligible classes, including DLC classes. Unlock All unlocks the displayed classes immediately. Existing unlock flags are preserved; change classes from the game's own menus. Enabling Dancer also grants Sword Avo +20. Disabling Dancer removes the ability, including from equipped slots. Unlock All grants it to eligible dancers.

Battalion Edit provides three independent actions: Refill Endurance, Max All, and Fill Missing Types. Existing battalions are preserved when adding missing types. New battalions start at level 1 with full endurance and their default gambit, and are not assigned to a character. Only obtainable types are added, up to the barracks capacity.

Support Edit shows the ranks available to each pair. Left/Right changes the rank immediately; Max All raises the selected character's supports to each pair's maximum. Support conversations still follow the game's progression.

Changes affect the running game; save in-game to keep them.

Requirements

• Fire Emblem: Three Houses v1.2.0
• Atmosphère with dmnt:cht
• Tesla Menu or Ultrahand with an overlay loader

Install

1. Download feth-overlay.ovl from the releases.
2. Copy it to sdmc:/switch/.overlays/feth-overlay.ovl.
3. Remove the old Item Trainer, Class Edit, and Support Edit .ovl files if they are installed.
4. Start the game, open your overlay menu, and select FETH Overlay.

Controls

• A opens a submenu, toggles a setting, or applies an edit. Item actions take effect when pressed.
• B returns to the previous menu.
• Left/Right adjusts a numeric value by 1 or changes a support rank immediately.
• L/R changes money by 10,000 and renown by 1,000.
• L + Down hides the overlay and keeps the current menu open for next time.

Documentation

• Development guide: building and contributing.
• Item ID list: Convoy item reference.

Credits

• 3096/feth-overlays: the original Item Trainer, Class Edit, and Support Edit overlays. This project retains and adapts their game data, memory layouts, and editing logic.
• Jacien: supported the original project and provided game information and testing.
• Falo's Three Houses save editor work: game-data research credited by the original overlays.
• jinghaihan/mhgu-overlay: project organization, shared menu styling, numeric controls, and automatic language detection.
• jinghaihan/feth-save-editor: the localized game names exported from its game database, originally provided by imouto1994 and Falo, and the per-character class eligibility and support-rank rules.
• WerWolv/libtesla: the original Tesla UI runtime.
• minazuki19/libtesla: the libtesla fork used by this overlay, including its layout, theme, and font support.
• Atmosphere-NX/Atmosphere-libs: the official dmnt:cht client used to access the running game.

Fire Emblem and related names are trademarks of Nintendo. This unofficial project is not affiliated with or endorsed by Nintendo or Intelligent Systems.

License

Original FETH code and its derivatives retain GPL-2.0. Original contributions by jinghaihan, marked with SPDX-License-Identifier: MIT, are covered by MIT. Dependencies and upstream assets retain their respective licenses and authorship.

The combined overlay is distributed under GPL-2.0; the MIT license does not relicense upstream code or assets.