Severity: Moderate Gameplay
How to recreate: kill off a sovereign (though this isn't necessary), have an adventurer's army in the field. You will be able to recruit them (As you should). However, here's the big.
If you have the gold to recruit the leader, you recruit the whole stack, whether you have the gold or not. You will go into the negative on gold, sometimes by as much as -200 or -300 if the stack costs enough. The game I played the asked cost was 71 gold and I spent 300.
Proposed solution: make the recruitment cost for the whole stack, make it all or nothing as a proposition.
These Autosaves might help. If you need to, kill off Magnar with Touch of Entropy (overpowered spell for killing off Sovs BTW- guaranteed 50 damage, needs to have a chance of failure or be level 7-8 not level 4)
Recruit the Army to the side, it will say cost 71 Gildar, but should and does cost a lot more, though you can recruit them as long as you get 71 Gildar (you'll go negative gildar though)