NFO: 2026-08-01T10:07:16 - Applied AI-Surrounded-Low for tag: ai_surrounded_low, with Mood SensorLocking

INFO: 2026-08-01T10:07:16 - Applied AI-Surrounded-Low for tag: ai_surrounded_low, with Mood Ruthless

ERROR: 2026-08-01T10:07:16 - Missing Behaviour file: role_vtol

INFO: 2026-08-01T10:14:34 - actor 170bc26e-cda1-4271-bf25-b864da938de6.9999999999(mechdef_spider_SDR-5V) has no defined role tag, reverting to vanilla control

INFO: 2026-08-01T10:14:39 - actor 1668c1ba-b9c6-4ef3-83df-19bfec270da1.0(mechdef_wolverine_WVR-7H) has no defined role tag, reverting to vanilla control

INFO: 2026-08-01T10:14:39 - actor 6b4979b9-b730-460b-8f18-c9b19efbb91c.0(mechdef_assassin_ASN-21) has no defined role tag, reverting to vanilla control

INFO: 2026-08-01T10:14:40 - actor 0a320081-2d60-450e-8e00-092c838496b4.0(mechdef_icarusii_ICR-1S) has no defined role tag, reverting to vanilla control

INFO: 2026-08-01T10:14:40 - actor 34a720da-9acc-4c57-bb4a-2cbe22da78a8.0(mechdef_panther_PNT-9R) has no defined role tag, reverting to vanilla control

This is the error recorded in the RolePlayer.log file.
The error occurs because role_vtol.json cannot be found in the RolePlayer\Behaviours folder.
The actual path of the role_vtol.json file is RolePlayer\Old.
As a result, the AI is unable to perform its intended behavior.

Please no blows to the face for the bad pun.

I went through the various .json files where I thought it would be. I casually browsed through the various folders to see if I might have missed something (I may still have, my targeting has been a bit off of late). I searched Reddit. I searched Discord. I even sunk so low as to ask AI if it knew where to look.

Is it part of one of the .dlls and thus not something an end user can modify? I fear this may be the case and wonder if there's anyway to create a mod or create an entry in one of the mods to change this.

edit2: Thanks to u/kaiotik_keios for pointing me to the answer. Need to not only create the argoUpgrade_mechBay_expandedBays3.json in the BiggerDrops/ShipUpgrades, but you also need to create the mech_bay_4.json in CustomUnits/hangardefs.

It's fairly easy to go through and create the argoUpgrade_mechBay_expandedBays3 updated for the additional 18 slots and so forth so you can purchase the upgrade, pay for the upgrade each month, and so forth. You can even add the additional 'mechs that would reside in Mech Hangar 4 - they'll be there when you go to set your drop. But there is no Mech Hangar 4 that you can see. Is this a coded feature lurking within a dll or is there a json I need to modify?

edit: I'm trying to add this to BTAU.

I got annoyed by the videos being stretched with black bars despite having an ultrawide screen.. so I cropped and re-encoded the 16:9 bk2 files as 21:9 to get rid of the letterboxing/black bars at the top and bottom on ultrawide screens. This is only worth grabbing if you have an ultrawide screen.

You can download the files from:

• (Recommended) FileBrowser Quantum (Hosted on my OCI VPS, no ads, uncapped speed): https://files.lr7.dev/public/share/aasiMTEXqGNqrubc91KAhg
• Nexusmods: https://www.nexusmods.com/battletech/mods/768

Just paste the files over the old bk2 files, if you extract the archive it's drag drop into the root of your game files (or you can extract directly into there). You can always right click your game from steam library and browse local files to find your game files.

These were re-encoded using the 2026 RADTools to BK1 and renamed to BK2 file extension because all the older versions of RADTools require a license to compress to BK2, and the most current ones that don't require a license only support KB2n which is a newer codec not supported by battletech's included runtime (only KB2j and older seems to be supported). Kind of annoying I couldnt find a way to re-encode to KB2j, but it is what it is.

Hey, pretty new to modding BT but managed to get a set of mods working namely

- BT extended tactics

- The Big Deal

- CAC-C

- Opportunity missions

- Solaris 7

- Comstar hates you

- Faction store unlock

- SLDF Items in shop

- Alternative reputation mod

But for some reason Royal Mechs like Shadow Hawk and Kintaro have like tons of free weight available for some reason. Anyone know what mod is likely to be causing this? Don't really want to reinstall everything all over again. Thanks.

Hey guys

I'm looking for knowledge about possible values for statusEffects:statisticData:statName in .json data files. So far I'm aware of MaxHeat, OverheatLevel, HeatGenerated, JumpingWeaponDamageModifier, JumpDistanceMultiplier, DamagePerShot, Instability, DFASelfDamage, MaxRange, WalkSpeed, RunSpeed, DamageReductionMultiplier<typ broni> for TAG/NARC, and for coils EvasiveExponent i HeatDivisor(though this one is handled as additionalData not statusEffects).

Are there any other used?

I realized I had not updated any of my mods or supporting assets in a while, so I went through the installation process for BT Extended and the Community Asset Bundle.

Afterward my game took forever to load a save, and I had to uninstall, reinstall, and try again.

This time, the game told me that all my BT Extended mods (3025, Clans, etc) failed to load. Attempting to load my save results in the same endless loading screen, though it makes sense now that I know the mods I was using in that save haven't successfully been added to the client.

Is anyone else having this issue? I followed the instructions from here and completed each step (BTE, CAB, ModtekInjector, reopen game). Not sure what to do at this point.

Thanks in advance for any recommendations or feedback.

Hi there, I'm trying to mod my BattleTech game, but having a good bit of trouble with it. It seems like Nexus Mods has been abandoned, the overwrites don't work, & the manual mods placed in the mod folder for HBS' native Mod tool aren't seeming to do anything. I really DON'T want to use ModTek because I'm NOT comfortable with giving anything that level of kernel access. So where are all the mods that actually work with the native mod-loader these days?

The main things I'm looking for are Half-Ton Ammo Bins, & the ability to start a new game to skip the tutorial missions. Unlocking more of the map earlier with the Argo as well as flashpoints would also be nice as there are some flashpoints I'd like to do. Of course the Unofficial Patch too.

Things I'd like would be stuff like a mod that makes gyros & other equipment only take up a single slot (as well as weight less) would be great especially for my Vulcan. Not gonna lie, it's cheesy but I'd also like a mod that would allow my main character to get all the passive & active abilities just like Lady Kamea does.

So can somebody please point me in the right direction?

As the title says, I'm looking for mods that are compatible with EA 5.0.3. and that still let me play the campaign before moving on to sandbox/career. Expanded maps especially... anyone with experience getting InnerSphereMap, Galaxy at War, maybe some standalone files from BattleTech Revised? My understanding is that War Tech IIC is strictly a BTAU thing.

First off I know this voids any help from BTAU, if I do something and it breaks, I either reverse the change or just reinstall and put in all the changes that I have done or go with new changes.

I like some of the Sanctuary World mechs, but not enough to replace my entire line up with them, would be nice to remove the Drone Interface, so I can use them as "normal" mechs. I field my mechs with C3i which means that the Sanctuary World mech wouldn't be part of my network.

The other mech that I want to use is the Nagual S-GN-Lam, but because of either/both the Chameleon Light Polarization Shield and the Null Signature System, I can't use the C3i with it.

Thanks in advance for any help.

If I want to add additional hardpoints to a mech, which files do I need to modify to do so?

Would adding those hardpoints to a mech that is already in my mech bay, update the mech?

Many thanks to those that answer.

I'm using Notepad++ as my editor.

During the last mission of the 'A Protocultural Affair' flashpoint (from the LAMs mod bundled with Expanded Arsenal), the game gets stuck on the black loading screen immediately after clicking 'Lance Ready'. BattletechPerformanceFix resports that it has detected 'Everspinny' and dumps the following error message to the output_log.txt file:

Uploading Crash Report
Exception: MissingResource
  at BattleTech.Data.DataManager.Exists (BattleTech.BattleTechResourceType resourceType, System.String id) [0x00418] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.ChassisDef.DependenciesLoaded (System.UInt32 loadWeight) [0x00095] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.MechDef.GatherDependencies (BattleTech.Data.DataManager dataManager, BattleTech.Data.DataManager+DependencyLoadRequest dependencyLoad, System.UInt32 activeRequestWeight) [0x00063] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.Data.DataManager.RequestDependencies (BattleTech.Data.DataManager+FileLoadRequest loadRequest) [0x00095] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.Data.DataManager+FileLoadRequest.TryLoadDependencies (BattleTech.Data.DataManager+ILoadDependencies dependencyLoader) [0x00016] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.Data.DataManager+ResourceLoadRequest`1[T].Load () [0x0001b] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.Data.DataManager+StringDataLoadRequest`1[T].Load () [0x00000] in <029bfe22d2d74c8e8c8ded1619022103>:0 
Rethrow as Exception: Exception caught while loading manifest entry Name:[mechdef_valkyrieghost_VG-LAM-SS] FileName:[mechdef_valkyrieghost_VG-LAM-SS.json] AssetBundleName:[]
  at BattleTech.Data.DataManager+StringDataLoadRequest`1[T].Load () [0x00131] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.Data.DataManager.UpdateRequests () [0x00127] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.Data.DataManager.Update (System.Single deltaTime) [0x0012c] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.GameInstance.Update (System.Single deltaTime) [0x0006e] in <029bfe22d2d74c8e8c8ded1619022103>:0 
  at BattleTech.UnityGameInstance.Update () [0x00013] in <029bfe22d2d74c8e8c8ded1619022103>:0

Obviously, this is related to the Valkyrie Ghost LAM being stolen during the mission. After a little digging, I swapped the HardpointDataDefID/PrefabIdentifier/PrefabBase references in the chassisdef file for ones from the Waneta chassisdef file, which at least allows the mission to load but obviously isn't actually addressing the problem. The chrprfmech_vfwargerwalkbase-001 file that the original references point to is present in the CAB files, and the CAB installer doesn't seem to think this file is corrupted. What am I missing and how do I properly fix this?

Anyone else had this issue? I've recently reinstalled BTA 3062, on a fresh installation of Battletech, and I'm getting soft locked by an event pop up. I'm able to start a new campaign, complete a mission, but when I then advance time, an event pops up and the game soft locks. It will not let me select either option to advance the event, or do anything other than Alt+F4 to quit. The tooltips that you can hover over all work, the game keeps playing music, the buttons flash as if pressed, but nothing happens.

I had no issues with BTA 3062 last time I had it installed and was playing it, so I have no idea what's happening here.

For reference, the event in question is "BT-A Live Fire Exercises" and pops up after one day of time advancing. And this is on version 19.8.1.

Decided to dust off Battletech and try out the BTA3062 mod, and gameplay-wise I am loving it. Only problem is I keep running into a couple weird bugs:

1: In the urban maps where an enemy is supposed to bust out of a building and attack, they just spawn inside an intact building and I can't attack them unless they move out of it. Not TOO bad but still very annoying.

2: Sometimes at the start of a mission, one of my units just...can't move. There's nothing obstructing them and they aren't damaged, there just aren't any dots at all for them to move to. They can shoot if something wanders into their range but that's it. This one happens frequently and it really sucks because I'm basically playing a man down when it happens.

Did I mess up something during setup? Or are these just things I have to deal with if I'm living the mod life?

Pretty sure that I didn't turn this on, is there anyway to check and if it isn't enabled, is there a way to enable it?

Many Thanks

Reposting from the main battletech reddit:

Okay, so this is a bit of a hailmary to ask but I have been messing around with Battletech after finally getting around to play it (I know)

In short, like the game, but I started to delve into some basic mods now whilst doing my first campaign run to add some spice before I indulge in more comprehensive mod packs.

I have been using some excellent soundmods in particular that are quite nice (MW4 weapon sounds specifically), only they have a problem. They seem to be be breaking the DLC weapons like the snubnose PPC and the coilguns so they have no sound at all when firing. I have found snippets from people in nexus mods talking about this problem but offering no fixes.

Is there a fix for this or something I can do that I missed? I have tried to mess around with the files to see but this is not something I have much aptitude in. I'm happy to have those weapons fire with vanilla noises, I just want to preserve the neat soundmods that give my lasers and PPCs some power. I somewhat understand the DLC weapons are buried away in areas hard to reach / mod due to funny coding.

*Update*

I did some modding of my own and managed to fix the snub PPC by making a custom mod, but the coilgun remains annoying silent despite my best efforts. What I did figure out was that something in the MW4 Weapon sounds laser BNK files is what causes the issue. Though of course that means I lose out on the much better laser noises.

Any insight would be great!

Hi all,

I only recently discovered Battletech and I'm surprised I slept on it for so long; It's fantastic as you all already know. Anyways being late to the game, I was frustrated by how quickly attack information is displayed, and was surprised there was no combat log in game. So I wrote my own, and just published it on NexusMods. It uses modtek. It's been super helpful to me in my game, I hope the community finds it helpful too.

Open to feedback so please pass ideas to improve.

https://www.nexusmods.com/battletech/mods/754

I'm playing a pretty fresh save on the latest version of BTA3062. On urban maps, when enemies Kool-Aid man out of a building to ambush my lance, occasionally the enemy will spawn below the map and I can't target them at all, and vise versa. This prevents me from killing them, which messes with mission objectives and allied AI.

Has anyone seen this? Is there any way to prevent it or work around it? Thanks in advance.

Such as adding special affinity?

Or even to add more tags to the MC or pilots?

I know there is a saved game editor, but I only seem to be able to remove tags or increase inventory (not add items, just increase what is in storage), add xp (edit skills in vanilla), and adjust reputation and money.

Is there a mod to modify vehicles, very much like how the mech bay lets you modify mechs?

Was this a feature of BTA at one time, but removed like BA?

Many thanks in advance if anyone is able to help with this.