Ah, yes, I downloaded the Cold Caelum mod and now they don't suck anymore.
Anyhow, I burned the midnight oils until 4:00 AM Last night playing away at my plan. It was going well, and I started next to a (then unmodded) Caelum, so I had a wimp to beat up on. It was going well, until Jotenheim cast Burden of Time or whatever that spell is. I only picked a single growth bump, as I really wanted fire magic. Soon, however, my provinces declined. Then the Ermor, Soul Gate Flavor, came through and literally ripped up my empire. My dominion dropped like mad, and my priests got slaughtered before they could get banish all those baddies. I'd relied mostly on the cheap ones and the Priest Kings. My hordes of cross-breeds, with the occasional big one, did very well, but they eventually lost out to the hundreds of shadow thingies that are completely immune to the primary weapon of the weak hordes, that is, the plague/disease stuff. The very thing that let me whip the independants around me cost me, and on top of all that, I'd focused so much on priests that I forgot to invest in archers. With Jotenheim on the right and Ermor on the left, and the rest of the world conquered, my little empire grew smaller until it was just me, my capital, and a couple of sattelite provinces that I had saved by summoning massive amounts of devils and imps. (I stopped the cross-breeding as soon as I got that spell, as it was more cost effective and I had a ton of blood slaves.) I then realized that with all the death world enchantments my Ermor and Jotunheim, my population was shrinking bigtime. So I really raised the blood hunting to cash in as soon as possible.
I'm not sure if it could ever work, but I had no choice, so I summoned a couple Heliophagus, after the first one could summon, and set them to auto-summon a horde of demons and summoned up Fallen Angels to summon up imps. I had no choice, as I was running out of people. After making some noise several turns later, I realized I wasn't going to win, what with zero people in my capital. So
Anyhow, I'm going at it again during the Super Bowl. I'll take what y'all you are saying into serious consideration.