When I teleport for an adventure battle, the "whag" army do not follow into battle. Having in consideration that the units key to win every battle like this are needed, the "whag" army should be with you for this.

I don't think it's an issue considering you have 20 units in main stack including bunch of OP heroes

Is not as much as an issue but a waste of flavor, to say it in some way? Those battles, in my understanding, are design on using each unit provided by the realted adventure (best example is Chofrs, using the girocopters to intercept the convoy before arrives to replenish ammo to main army). So, having the units of each adventure on the "whag", you need or recruit the same units manually, or do the battle without them (even if is winnable, as you mentined).

so far from testing, this mod breaks LUA coding for Realms of Chaos, so that it is unusable in there, and you cannot play any of the adventures

I didn't touch adventures mission only `unlocked` them in UI

Mmm, Can you share the minimal list of required mods in order to cause the bug. and the load order you use (if not default)

And what missions are you talking about?

I have tried again, and it seems that he adventures are playable, you just cannot teleport to them now, also, when you do finish adventures, while finishing the first one to unlock the others works, finishing more of them to unlock the Skaven Adventure does not work.

Have tested it without Mixu's Legendary Lords and this happened, but I noticed that adventures are available from Turn 1, rather than the 5th turn as it is as standard, maybe that could be a cause?

After doing some more testing with nearly no mods (not even Mixer) it looks like your mod is on its own causing LUA errors.

Only other mods I have on are graphical mods and the console commands mod

The guy above mentioned that support army doesn't teleport to mission. So it's unlikely that same mod allows teleportation for one player and not for other one

Can you describe in more details what is not working and what steps I should take to reproduce it?

well its seems to be LUA related, so you might want to look for stuff that would tell you what script gets broken, you might have better luck asking on Da Modding Den discord about it because I know nearly nothing about scripting

if you need a link to the discord I can post it

and one of the reasons I know it was LUA related is because in ingame options I have Modding Context Viewer turned on, which shows a large red X if there was a LUA break

and the break shows up as soon as you start a Realms of Chaos campaign as Malakai

Can you take a look at the logs and look for callstack error?

Man, I'm aware of modding discord. And I have a link on mod page :)