I was reading some of the other posts and I was caught up with the idea, of not being able to explore the map fully before conquering it. I thought back to the games I've had so far and it kind of sounded familiar. There are obviously many isssues and questions with the open border. I mean one wouldn't want an army travelling their realm even if it was to kill a nasty golem, or doing some quest(what, a 7 company army lead by a sovereign going to search some ruins, and your not here to pillage my villages... riight...).
So I had this idea, what if champions, monsters and trained soldiers related to each other as sort of the paper scissor rock way. Champions being able to handle all monsters alone potentially as they level up through traits that would increase attack and defense against elemental, twisted etc. while staying in a fairly even bases with soldiers(increase a single unit base hp to 12 for example), increase the potential of normal weapons and the special weapons and armor would have a more circumstantial bonus. While all monsters getting a sort of fear aura of sort reducing attack and defense of normal trained soldiers, aura scaling in power as the monsters get bigger and nastier(I think the aura could be multiplyed with squad size as x3, x5..x9).
So why? I was thinking this has the potential to solve many issues. First champions would not be able to fight wars alone against other civilizations(taking cities etc.) which imho they allready can't, but some seem to be able to... dunno.
Anyhows second point being that you could simply allow champions to roam the realm, maybe make some more dangerous zones that would be sure to last till the late game etc. and would finally really give the champions this adventuring sub-game that is so cool and enjoyable about the game.
Also, one additional idea, is that sov. and champions should have a natural higher movement speed than normal soldiers. I think an increase it to 3 at least. Also I think a sort of escape mechanism before the spell should be available to champions alone. for example, if not adjacent to the creature has a chanse to escape and end up in a random adjacent land. Should be a sort of ability.
So all in all that would allow champions to really play the role in adventuring and quest kind of glory while real wars would still have to be fought with soldiers etc where champions would be more of a support mage role and less of a capable fighter as a alone against a 100.