Did you report it as a bug?  That's certainly a bug.  Anytime a Sovereign dies while they have cities left they should be returned to the nearest city.

They can't capture Ophidians the last time I checked, as they are immune to everything, but that might change in the next patch.  Not sure they were suppose to be immune.  Haven't tried it on Naja.

Why?

Various play styles don't NEED to be balanced.  They just need to be fun and viable.  It's an entirely single player game.  For once we can avoid bowing down to the almighty god Balance.  

Juggernauts (for example) are overpowered vis-a-vis other play styles.  So what?  They're also one of the only distinct factors in the game.  They're fun.  

If the devs focus on making sure all the play styles are fun, we'll all be better off.  Play styles certainly need to be viable.  That's not the same thing as balanced.  

Shitcan balance and concentrate on fun and viable.  The game will be better for it.  

One of the reasons we need multi-player is so that players can bring their overpowered juggernauts and overpowered beastlords to me.  You will wail and burn in my stinking mud (which is overpowered by the way). 

Nonsense.  You say all this like people haven't been playing the game, and winning, on all difficulty levels without playing as Trogs since release (and long before, really).  There is no One Right Way and to suggest one exists is asinine.  Play the way that is fun to you.  I've played probably 6 games to completion since release and only one used Juggs.  And in only one other was a Juggernaut based faction a threat to me.  

To claim that Juggernauts are the only proper way to play the game is ludicrous.  By midgame my Adventurous Betrayer Sovereign who has stolen the souls of nearly every free hero he has recruited in order to gain easy spell levels oneshots armies of Juggs with one spell before they can move.  Clearly, that one spell is overpowered and anyone not playing my preferred way is gimping themselves, tying one arm behind their back, and failing to play The One Right Way.  

+1 to anyone who can guess the one spell.  

That doesn't mean that other play styles don't need some love.  They certainly do.  However the love they need isn't "balance", it's distinction.  

Brad will program Juggernaut neutralization strategies into the tactical AI if you just tell him or show him in a YouTube video what they are.  Brad is a sucker for YouTube videos. 

P.S.  YouTube is overpowered.

You can switch out factions during the game via cheats.

Cheats are...oh, but you've heard it before.

This is true, but also irrelevant, since the AI will never do it.  I've noticed that a lot of the arguments against changing OP stuff boil down to "I could beat it with X tactic".  And I'm sure any halfway decent player could!  To be clear, I am not having any difficulty fighting enemy Juggernauts, the AI is.  By way of example, in my current game I'm fighting the Trogs and winning handily, thanks to my use of mounted archer units (which themselves are arguably OP).  But the AI under-builds ranged units, prioritizes targets poorly, and rarely builds mounted untis (and never mounted archers).  A human player could also crush a Juggernaut invasion with spiders, intelligent spell-craft, high-dodge units, sacrificial summon-spam, hit-and-run strikes with high-initiative units, scrolls, the Silver Tongue ability, or a dozen other tactics.  The AI will employ none of these options.  It could be programmed to do so, but Juggs are hardly the only Invincible Strategy available to human players, and fixing the computer so that it can intelligently respond to all of them would require an enormous amount of effort.  Therefore, it makes more sense to either nerf strategies which can win even high-difficulty games with minimal effort, or introduce direct counters into the game.  Or both, perhaps with some AI improvements as well.  I don't care what is done, as long as some of the most egregiously OP strategies are addressed.  

Agree!