I have conquered everything but a couple of outposts of my last enemy: Relias. He is in my territory (I just conquered his last city so his domain became mine) with a couple of subarmies of little importance (at that point). I can take my Sovereign out, cloud walk next to him and defeat the poor Lord. But being as nice as I'm, I decide to use Firestorm on him for 15 fire damage (+15per Fire Shard, of which I have 4).

I select the spell and target Relias, destroying him and his lackeys.

Expected results? Relias dead and me winning the game.

What really happened? Relias dead and me unable to achieve conquest victory even after defeating all the remains (subarmies and outposts). There is no "Bye bye Altar" window nor "Relias gives you the finger and uses his powers to run".

Killing everything else and using Firestorm on Relias when he is the last man standing gets same results of not being able to achieve conquest victory.

Using the reveal map cheat to check a possible respawn of Relias somewhere (like that tiny island in the corner), proves that he doesn't respawn.

 So...

I add a link to the lastest savegame where only Relias' army is standing: Waldo (phantom influence zones haunt some areas when loading the game... Verga really hated me!!!!) It's a matter of Firestorm. If you try Fire Pillar (I can cast 3 each turn but you only need 2 to kill him), the same issue happens.