Well, i'm pretty sure Flames from Afar would be quite painful to 20+ Seraphs. But in combat, I've never seen anything beat a large group of Seraphs. Maybe an army of Devils or other summons would work well. A lone SC wouldn't have a chance against the 200+ False Horrors, but a group of them would eventually push their way to the Seraphs, who would be asleep from exhaustion after so many turns.
Its also useful to know that Seraphs can't seige a fortification in a million years. Even a group of 20 Seraphs would need a half dozen turns sometimes. So building castles is a good defence against Caelum, since it means the worst they can do is cause unrest and disrupt income for a turn.
Also, is everybody forgetting that anything etheral can fly through a storm? That means etheral SCs or Ghosts or Vampires can attack Seraphs directly on the first turn. If you have more then Caelum has Seraphs, you'll win. In mid to late game, any player with a blood economy should have no problem attacking Caelum. And you don't need to attack Caelum's armies, obviously you attack Caelum's empire and force his armies into a defence posture.
Its just really expensive (or impossible) to defeat massive amounts of False Horrors with your "normal" units. And defeating it early game is almost impossible, which is why False Horror is level 6 research. But obviously it pays off to do the research and raid all you unsuspecting opponents before they can summon an army to stop you. That's simply a good strategy.
Anyways, I'm gonna stop telling you guys how to kick my ***, and get back to playing
