I don't know about everyone else, but after playing through a few games, every once in a while I would come across a spawned creature with totally crazy off the wall stats. One time it was a Pack Drake with 34.8 million health, another was some flavor of ogre with 500k+, you get the picture....
Well, figured out how it was happening...
Creatures spawn outside kingdom territorial limits and where game topography allow. Well, sometimes they get stuck. I saw one of the little demon assassin guys stuck in just such a situation, but that in itself is not the problem. The problem is, the NEXT creature spawned right on top of him, and they had instantaneous combat and the beastie leveled up. And it kept happening. Every turn. And since health increases go up on a curve, I am assuming that is how the 34.8 mil health Pack Drake came to be.
As a side note, I was able to break the demon guy out by using the lower land spell a few times, and he ran over a fully party of late game NPCs/heroes, because, as health goes up, so do offense and defense. I couldn't hit him, and he was "one shoting" full companies.
Ah well, it was amusing for a sec....