I successfully summoned all seven Demon Lords to Elysium. I accomplished that by savescumming, if I hadn't savescummed I'd certainly have a different story for this post. There's seven demon lords and all but one or two can easily wipe out armies on their own, and if I'd failed to bind them they would've been free to wreak havoc across the world. After killing me, of course.
So anyway, I had Belial, who starts each battle by attempting to charm the entire enemy army, usually succeeding with at least ten or fifteen of them, and Buer, the Goat Sun, who just scorches the shit out of everything, going off to hunt down and exterminate the last remnants of senator Camillus's holdings. Camillus himself had been seduced by a succubus and killed by his own men, which is disappointing. I'd hoped to capture him and bring him along in my army as a prisoner.
Buer attacked a village for a couple more sacrifices per turn and found that the ruler of the village, a vampire, had a ruby scepter that made him immune to fire damage. Which is all Buer does aside from his hooves.
So my demon lord, probably the most powerful of all of them when it comes to just smashing through armies, who had more than 800 kills on his record by the time the game ended, was defeated in single combat by a vampire.
That was only a minor setback of course and he came back once I had enough sacrifices to summon him again, and then I set him against the Hoburgs.
Conquest of Elysium 4