
Robot Legion
Build a steampunk robot army. Workers automate jobs while combatants fight beside you through three boss dungeons. Trade with engineer villagers for rare parts.
Screenshots






About this Mod
Robot Legion
Build, command, and fight alongside a steampunk-themed legion of humanoid
robots. Automate your worker chores, deploy combat squads, breach three tiers of
boss dungeons, and trade with engineer villagers for rare parts. Robot Legion
is a content-rich Fabric 1.21.1 mod with worker robots, combat robots, boss
fights, structures, custom blocks, items, and an in-game guidebook.
Worker Robots
Six worker classes automate the grind so you can focus on adventuring.
- Miner — Scans for ores within a configurable range, tunnels to them with its
glowing pickaxe, and pillars itself back to the surface when the trip count is
full. - Lumberjack — Fells whole trees and replants saplings.
- Farmer — Tills soil, plants the crops you select, waters them with the
watering can equipment series, and harvests on cycle. - Porter — Hovering drone with 27 storage slots. Carries chests, barrels and
smelters that you specify. - Crafter — Runs crafting recipes you queue up from its on-board inventory.
- Animal Handler — Herds, breeds, and shears the livestock you choose.
Each worker can be assigned a custom work area with the Range Setter, given
commands (Follow / Stay / Work / Attack), and inspected via the Robot Tracker
tablet.
Combat Robots (11 subtypes)
Your frontline. Mix and match for the right composition.
- Swordsman — Iron-tier sword wielder. Reliable melee anchor.
- Tesla Trooper — Dual-arm Tesla gauntlets, mid-range chain lightning. Great
against groups. - Medic — Heals all your robots and you with a passive aura. Essential.
- Grenadier — Ranged AoE bomber with slowness debuff.
Three Boss Dungeons
Each boss drops a unique Trophy + Boss Core used to craft progressively stronger
gear and to build a Trophy Block that auto-deposits more cores into a linked
chest over time.
- Lv1 — Steel Swordmaster at the Abandoned Factory: a Diamond-tier melee duelist
with phase changes. - Lv2 — Bombard Fortress at the Prototype Hangar: a colossal cannon emplacement
with three-stage barrage attacks. Watch out for the steam vents. - Lv3 — Thunder Sorcerer at the Substation Ruins: a teleporting plasma caster
with a Tesla field and lightning drone summons. The final boss.
Engineer Villager Trading
Locate Engineer Huts in plains and forest biomes to find the green-robed
Engineer villager. Trade with them for Scrap Metal, Circuit Boards, Robot Cores,
and other essential parts. Out of villagers? Use the Engineer Certificate on
any regular villager to convert them.
Two locator items help here: the Engineer Locator maps the nearest Engineer Hut,
and the Factory Locator maps the nearest dungeon.
Player Tank
A steam-powered four-wheeled tank you can ride. Cannon on the left mouse, homing
rocket on the right. Refuel with coal. Repair and recover with the Tank Wrench.
Engineer's Manual (in-game guidebook)
A 53-page illustrated handbook that ships with the mod. Covers every item,
recipe, robot, dungeon, and boss with crafting tables and walkthroughs.
Localized into Japanese (日本語), English, and Simplified Chinese (简体中文).
Getting Started
- Craft the Robot Crafting Bench (Iron, Copper, Planks, Redstone) — this is the
central crafting station for the mod. - Find an Engineer Villager in their hut (or convert a regular villager).
- Trade or craft to gather Scrap Metal, Circuit Boards, and a Robot Core.
- Build your first Swordsman Robot and right-click to issue Follow / Stay / Attack commands.
- Craft a Boss Map Lv1 and follow it to your first boss fight.
The Engineer's Manual is auto-granted the first time you join a world.
Requirements
- Minecraft 1.21.1
- Fabric Loader 0.16.0+
- Fabric API
- Java 21
License
MIT. Source contributions and feedback welcome.
Available Versions
How to Install Robot Legion on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).
Install Mod
Open the mod browser in the dashboard and search for "Robot Legion". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.1
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Robot Legion server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.
Is Robot Legion compatible with fabric?
Robot Legion officially supports fabric for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Robot Legion – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Robot Legion consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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