Quote Originally Posted by Makanyane
Don't think was mentioned specifically as point 2 there I think refers to regions file, but placing slave army that is sub_faction of a faction that isn't in descr_strat.txt causes CTD on scroll over.

(probably predictable that one and yes, I am having a bad day )
Not so predictable.
I found it by my own, but depending on the configuration of the mod you can solve it by putting the faction as "emergent by event" and non-playable in descr_strat and also in descr_sm_faction. Of course, that even doesn't exist.