[Cohen]

The true problem is that Caelum get province raider (as Vanheim and Man thuata, but they don't fly, but are stelthy) with only gold!

Even more Caelum and Vanheim have them non capitol only.

Even more Caelum has his mages costing far low than everyone else (and pythium too has good mages for 150 gold, but they cannot compete with 175 gold Arch Seraph).

Boron already told about Abysya, or Mictlan, even if you can give to a scout/assassin a Sceptre of Leadership or such (well I once tried with a marignonite spy, to lead some Sidhe troops recruitable by the Glowing Hill site), and Flying Boots, you always require gem income, and proper mage to forge the item.

Caelum doesn't need that.
However the real problem IMO are:

False Horror, to review
Pricing of Mages, to raise.
Make at least Arch Seraph capitol only.

Seraphs are still good but if their price will go at least at 150 I believe they could be fine.
Arch Seraph should be 270 or 300, considering too their paths are from the best ones (Air at least, and water 2 means quickness and clams and boots of quickness).

Ps: Quantum, Ryleh PD could kill even an SC with some luck, I got in a game some Banelords killed by Ryleh PD because they get paralized, but the Illith need some luck to paralize the Banelords. Even if the Banelord wins, but get paralized for some turns, he risks afflictions.