Mods

• 55X - The Ultimate Balance Modby Spud DastardlySpud Dastardly presents the biggest Master of Orion: Conquer the Stars mod in the galaxy! This mod is massive overhaul of the gameplay experience. It's effectively a full expansion pack for the game. It includes a total rebalance of every aspect of gameplay, new technologies, improved AI, and muc...53.1k downloadsupdated 14 mo ago
• UUnofficial Code Patch Steam Workshopby WhatIsSolVERSION UCP 6.4b To make this mod actually work you MUST follow the included “ReadMe.txt” for the install instructions. This must be done everytime you want to upgrade to the new version! Version 6.4+ of UCP requires a new game, older saves will not work. Here is a Steam Guide for installing or f...38.0k downloadsupdated 3 y ago
• 55X UCP Compatibility Mod (5XCPC)by Spud DastardlyThis mod is for people using 5X - The Ultimate Balance Mod with WhatIsSol's Unofficial Code Patch. The base 5X mod is designed to run without UCP. The purpose of this mod is to re-optimize 5X to run with UCP and to take advantage of additional modding features added by UCP. This mod shouldn't be...28.6k downloadsupdated 14 mo ago
• MMorePerkPointsby risktaker3This mod adds 200 perk points when building a custom character. Note: I actually forgot about this mod and I found it when I started to play the game on my steam deck. Sorry about not putting a proper description in the mod originally, I appreciate the “constructive feedback 😂. I will also have t...22.8k downloadsupdated 10 y ago
• CCheapPerksby DavidA simple mod that reduce the cost of all perks to 1. This allows you to make a custom super race. Enjoy.18.6k downloadsupdated 10 y ago
• DDiverse Specials and Massive Planets v2.5 - 5X/UCP Compatibleby 76561198327470169(This is the full version) Compatible with 5X v4.4.1 This mod adds over 100 new specials that can appear on planets in game! Massive planets can be found now too, at a low chance and only in certain orbits. Between the Advanced Resource Extraction tech field and a few others, I've added 13 techno...16.8k downloadsupdated 7 y ago
• PPollution Structures Boostby Mituna**Updated to work in 2026!** This improves the pollution cleanup rate of all pollution management structures, and reduces the maintenance costs of all of them by 1. The improvements are as follows: Atmosphere Renewer: 5 => 10; Toxic Processor: 5 => 15; Pollution Processor: 15 => 30; Core Waste Du...15.7k downloadsupdated 7 mo ago
• PPlanetary Core Engineering v2by SteelTired of not being able to terraform Volcanic and Inferno planets? This mod allows players to terraform Volcanic and Inferno worlds. Any race with the Lava Breather perk will be able to build the Core Destabilizer colony project. The Core Destabilizer will convert any non volcanic world to Volcan...12.6k downloadsupdated 5 y ago
• SStronger Fortifications v1 (For 54.11)by Sunshine & HappinessLarge fortifications like starbases should be stronger than they are. They should serve as a serious deterrent to planetary conquest. Stronger fortifications can also minimize the damage of losing a fleet in a large battle, making it easier to mount a resistance to an invading force. Changes to s...11.9k downloadsupdated 10 y ago
• UUnlimited Doom Stars (Up-to-date as of 2/7/17)by shadowwolftjcTired of being restricted to building just 1 Doom Star? Well, now that restriction has been lifted. Want to quickly see this mod in action? Try running it with this mod:9.8k downloadsupdated 10 y ago
• CCustom 5X and DSMP Assetsby Spud DastardlyNOTE: Run installer if you haven't since March 1, 2024 Using this mod requires more than just subscribing to it. Please follow the install instructions below. This mod contains some custom assets I created for 5X - The Ultimate Balance Mod. In particular it has alternate ship icons for the hulls...9.1k downloadsupdated 14 mo ago
• AAll AI + 5X Galaxies v1.9by Spud DastardlyThis mod combines the ALL AI mod by Dazgrum, which lets you play with more than 9 players on a galaxy, with the added galaxy types, ages, and density settings from 5X - The Ultimate Balance Mod. The prerequisite mods/DLC are optional; just make sure you don't try to start a game with more races t...8.7k downloadsupdated 13 mo ago
• SSplit Tech Tree (5X Addon)by Spud DastardlyThis mod splits the tech tree into 8 branches: Construction, Power, Sociology, Chemistry, Computers, Biology, Fields, and Physics. Each tech is reclassified into one of these branches primarily using MoO2's tech tree as a guide for which techs should go into which branches. Starting ages and avai...8.5k downloadsupdated 14 mo ago
• BBattle Pods Revertby Mituna**Updated to work in 2026!** This reverts Battle Pods to providing 50% extra space with 0 space cost. The production cost is adjusted slightly up to the old value of (2 + Hull Size * 2.7) There should be no conflicts with any other mods as long as they do not modify Battle Pods. This mod should w...8.1k downloadsupdated 7 mo ago
• PPerk Points 15by Infinite ProbabilitySimple mod that gives Custom Race 15 points starting instead of 10. I find it a bit more balanced.7.8k downloadsupdated 10 y ago
• MMoOlaby Spud DastardlyThis is the closest to an unlimited money cheat we're going to get. This mod adds a perk to the custom race screen that, if chosen, unlocks a structure buildable only on your homeworld that gives 100,000 BC per turn. The name of the mod comes from the MoO2 cheat code of the same name. Please let...7.6k downloadsupdated 9 y ago
• DDiverse Specials and Massive Planets v2.5by 76561198327470169This is the original stand-alone release, no other mods are required for this version. Over 100 custom specials can now appear on planets during galaxy generation. Specials range from simple things like "Merchant Traders" to the more rare and desirable "Orion Artifacts". Some of these are inspire...7.4k downloadsupdated 7 y ago
• LLots of Planetsby tbeierNow part of the: T-Best Uber Unbalanced Mega Mod Normal density now has up to 35% chance of having 5 planets per star. High density now has up to 90% chance of having 5 planets per star. I actually tried to create 10 planets per star, but it was a mess (3 planets overlapping, etc). As I was doing...7.2k downloadsupdated 10 y ago
• UUber Custom Raceby DavidThis mod increases the bonuses of many perks and reduce the cost so you can make an overpowered uber race if you want to. Technologist is expanded to give more benefits. I recommend No Pollution mod if you want to go with the high production bonus. In some cases Omniscience has caused my game to...6.9k downloadsupdated 10 y ago
• EEven Bigger Planetsby CendInspired by the "Diverse Specials and Massive Planets" mod this one simply adds two more planet sizes to the game - Colossal (size 40) and Gigantic (size 50). It also changes Orion to be Gigantic. Though it doesn't need the "Diverse Specials and Massive Planets" mod (i shamelessly copied the mass...6.9k downloadsupdated 3 y ago
• BBigger Planets 2.0by nameistoadDescription edited on September 14, 2018 to say this mod still works with UCP 5.8 and 5x 4.3.0. Enjoy! This little mod just raises the sizes of the planets. Tiny worlds go from 8 max to 18 max, huge worlds go from 24 max to 42 max. Watch out for much higher pollution amounts. More workers means m...6.8k downloadsupdated 9 y ago
• CCheapPerks - Creative gives +50% researchby DavidSimple mod that reduce cost of perks to 1. This allows you to make a custom super race. Same as my CheapPerks, but I changed Creative to automaticly give +50% research rate (instead of +25%). Enjoy. This mod has been reported to no longer work after latest patch. I dont know when I will have time...6.1k downloadsupdated 10 y ago
• SStronger Ships Remasteredby K_RLSimply makes ships, monsters and space fortifications stronger in the aim of having longer battles. Ships have received the following improvements: -HP: 10x -Space (for modules): 5X Module costs have also been edited to accommodate these changes.5.5k downloadsupdated 3 y ago
• [[OBSOLETE] 12 Slot Hull & AutoExplore FDCby raccoon- 12 slots for weapons and 12 slots for specials. From frigate to doomstar. - Frigate, Destroyer and Cruiser can now auto-explore. Game version 51.3. ShipHullTypes.yaml modified.5.4k downloadsupdated 10 y ago
• UUber planetsby A-tfFor more variety there are a small chance that when you create a galaxy will appear Uber planets: Tropical, Cavernous, Inferno and Grassland! Also slightly adjusted chances of the planets depending on type stars on the basis of scientific information. For example, the volcanic and inferno planets...5.2k downloadsupdated 10 y ago
• Vvolcanic coolingby HinausautoThis mod adds ability to terraform volcanic planets to barren. Tech is unlocked via Trans Genetics. Special thanks to tbeier.4.9k downloadsupdated 10 y ago
• TTactical Mod 3.8by vaaishTactical Mod adds more depth to the MOO:CTS tactical battles by adjusting the way ships maneuver, giving weapon categories and individual weapons roles, adjusting how player build ships, and changing how the AI designs their ships and fleets. Balance in the mod is not passive mathematical balance...4.8k downloadsupdated 12 mo ago
• AAI Can't Ignore Youby Spud DastardlyThis mod disables the ability of the AI to refuse an audience with you. It should be compatible with all other mods. For best results, put this mod at the end (bottom) of your mods list in game.4.7k downloadsupdated 10 y ago
• OOutposts Anywhere v1.1by SteelWith this mod you can build outposts and jump gates anywhere, even systems you do not own. Please note that jump gates are restricted to one per system.4.5k downloadsupdated 5 y ago
• EeXoMods - Antarans Rebalancedby ExoclypsThis mod re-balances the Antaran attack force. Changes it makes: * Reduced size from 50% of player fleet to 25% of player fleet. * Reduced minimal fleet size to 2 frigates. * Changes priority on Destroyer ships to Battleships. Resulting in an overall smaller fleet. * Redesigns the Antaran Ships t...4.4k downloadsupdated 10 y ago
• RRealistic Stars with 7 Planets v1.3by A-tfThe mod changes the parameters of star systems in the game, making them a little more realistic and corresponding to scientific data. List of changes: 1. Maximum possible number of orbits in star systems has been increased from 5 to 7. If there is a sixth or seventh orbit, the size of the star sy...4.1k downloadsupdated 4 y ago
• AArcology 2.0by nameistoadThis little mod adds two buildings to the game which each increase the maximum population of the world. The Arcology comes with the Planetology tech and adds ten population. The Uber Arcology comes with Superscalar Construction and adds twenty population. Because this mod edits the tech tree, it...4.0k downloadsupdated 6 y ago
• RRealistic Minor Civilizationsby A-tfMinor civilizations are sometimes found on planets that do not correspond to them, for example: - Aquatic Akirians can be on Arid planet; - The Eldritch, who are described as “living in makeshifts tunnels under the surface of the planet”, or the Nyemorian with desolate landscape at the picture, a...3.9k downloadsupdated 7 y ago
• PPlanet Max Pop +4by Num7Planets of all size have their max population increased by 4. It’s a subtle change that makes the growth phase of the game last a bit longer, allows taller empire building, while not breaking anything. Makes pollution more of a potential issue as well. Nothing else is changed, pollution buildings...3.8k downloadsupdated 9 y ago
• 5500Perby ShadeThis mod allows you to choose perks with a 500 percent increase (Research , Defense etc) In order to balance the amount of pollution create by a 500% increase in production i also increased the cleaning rate of the pollution cleaning buildings The perks cost quite a lot but if you want to create...3.7k downloadsupdated 9 y ago
• CCollosal Galaxiesby leo_1452Enable collosal galaxies3.7k downloadsupdated 9 y ago
• FFighter Rangeby Red EarthIncreases fighter range from 60 to 100. Heavy guns are 90 range so 60 isn't even enough to let you launch before taking fire. At 100 range you can launch without having to close in. Flying slowly through enemy fire to launch fighters at short range seems like a very un-carrier thing to do. Only t...3.7k downloadsupdated 10 y ago
• [[OBSOLETE] Custom Race Cheat To The Stars v 1.03by raccoonv 1.03 - A lot more customization. - Added some perk levels. - Hid most of the complex perks that you can make from the simple ones (the non-custom races still use them, so don't worry). - I rethought how my mod should work thanks to Spud Dastardly's mod. It's an overhaul that looks very promisin...3.6k downloadsupdated 10 y ago
• EEinsteinby Spud DastardlyThis mod adds a 0 point custom race trait to the custom race screen that unlocks all technologies at the start of the game. It should be usable with or without the 5X mod. MoO2 veterans may recall that MoO2 had some cheat codes, one of which was "einstein" which instantly unlocked all technologie...3.5k downloadsupdated 8 y ago
• RRealistic Galaxy Ageby A-tfThis mod sets correct and realistic chances of stars of different types, depending on the age of galaxy. Differences from the original game: - Old galaxies have more stars red and brown types (aged stars from the bottom of main star sequence). - Average galaxies have more even distribution of sta...3.5k downloadsupdated 10 y ago
• RRealistic Planet Densityby A-tfThis mod tweak quantity of planets in dependence of star’s type. Differences from the original game: - Blue stars are very young and hot, so accordance to scientific opinion, they have slightly reduced chance of planet’s presence (they have not time to formed). - White, yellow, orange and red sta...3.2k downloadsupdated 10 y ago
• UUber Custom Raceby sir_sinalot02/25/19 Updated mod and added a few changes. Fixed and tested on a fresh install of game with no other mods installed. May not be compatible with some of the other mods that make changes to the tech tree. Doubled available module space and hp of all combat ship hulls from their original values....3.2k downloadsupdated 8 y ago
• FFighter Mods V2.0.3by killerproblemFighter Mods V2.0 Made with game Version 54.11 Tested with: 5X the ultimate balance mod v2.1.1 by Spud Dastardly: steam://openurl/ - V2.1.2, and v2.1.3 seem to have no conflicts either, just load this after his mod. This is my second try at making fighters a viable option throughout the game. Wit...3.2k downloadsupdated 10 y ago
• RRemove Tech Choicesby Mituna**Updated to work in 2026!** This removes the choices on the tech tree, allowing everyone to research everything as if they had the creative trait. There are some side effects to this: you will not be able to steal or trade any tech, as the game only considers branching techs to be eligible for s...3.1k downloadsupdated 7 mo ago
• MMorePerkPointsby risktaker3I have updated the mod to work with the version of the game as of 12.9.163.1k downloadsupdated 10 y ago
• MMany Opponentsby DavidThis mod simply allows up to 8 opponents in any galaxy type/size. You can still choose fewer opponents than the maximum 8, so it just gives you more freedom of choice. The Mod has been reported to cause trouble combined with "6 planets plus gas giant moons on worm holes" mod.3.0k downloadsupdated 10 y ago
• AAntaran Victory Without Attacksby Spud DastardlyWith this mod, you can still achieve the Antaran victory in the usual way, but the Antarans will not launch their regular attacks. Specifically, this sets the attacks to begin between turn 9000 and 9999, so this should effectively disable their attacks unless you play an absurdly long game. To ge...2.8k downloadsupdated 10 y ago
• EExtreme Races 1.1by tbeierNever mind the small 25% and 50% race bonuses, I changed them to 125% and 250%. Also the 25% and 50% penalty is now a 50% and 80% penalty. Let the smart be 250% smart, the strong be 250% strong, the weak be 50% weak, and the stupid be 50% stupid. Population Growth, Food from Population, Productio...2.8k downloadsupdated 10 y ago

348 mods, most downloaded first. Each one has its own page here with what it needs to run and where its author publishes it; the files themselves stay with the author and are never re-hosted on this site.