




Avian Transit Matrix Mod extends The Harpy Express: Extended modpack with custom match modifiers, gameplay balancing, and administrative tools. It adds an interactive guidebook that lists role abilities, items, and modifiers for players to read during matches. The mod also brings administrative boundary markers, item recovery checks, and detailed match settings.
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Features:
Game Modifiers:
- Introverted modifier drains player mood faster in crowds and slower when alone or near only one person.
- Taxed modifier reduces kill income when a killer eliminates too many targets within a short time window.
- Adaptive modifier penalizes repeating the same kill method while granting bonus income for switching tactics.
- Forbidden Lovers modifier pairs a civilian or neutral with a killer who must survive together until the match ends.
Items and Blocks:
- Adds the Guidebook item that opens a dual-page interface detailing civilian, killer, and neutral roles alongside modifiers.
- Introduces creative operator tools for ready room teleportation, spectator positioning, random spawn slots, and test player spawning.
- Expands building options with extra Panel blocks, Moquette fabric colors, and Steel Ornament designs.
- Adds the decorative Ish Plush block.
Gameplay Balancing and Mechanics:
- Adds an option to hide ability visual effects and sound effects so players cannot use them to confirm identities.
- Shuts down the Cleaner Deep Cleaning ability when the active survival player count drops below a set limit.
- Lets the Thief steal extra items such as pans, poison injectors, blowguns, pills, delusion vials, defense vials, and tape.
- Checks item positions during active games and teleports out-of-bounds drops back to the nearest alive player or body.
- Protects map blocks by preventing players from opening doors, pressing buttons, or pulling levers during matches.
- Adds a pronoun display system that shows chosen pronouns above player usernames at close range.
- Fixes issues with defense shield kill bypasses, spectator rejoining, and mood task data saving across reconnects.
Commands:
/watheextended:pronouns set <pronouns>: Sets your custom pronouns displayed above your username./watheextended:pronouns clear <target>: Clears a target player’s pronouns (Admin only)./watheextended:rtp slot: Sets random teleportation slots for the map.
How to Use:
- Open the pause menu and choose the settings screen to adjust match rules, role toggles, and item values.
- Right-click the Guidebook in your inventory to view role descriptions, ability details, and active modifiers.
- Type
/watheextended:pronouns set <pronouns>in chat to show your preferred pronouns to nearby players.
Screenshots:





Avian Transit Matrix Mod Download Links
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on the file's original source — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Avian Transit Matrix Mod (1.21.1) – Fresh Modifiers for Train Murder Mysteries is a free Minecraft Java mod. Compatible with Minecraft 1.21.1. Download it and open it directly in the game.