It's Caelian, not Caeline. See LA Caelum and Caelian Seraph.
While your sprites are pretty good, I find the white and yellow wings way too bright on my computer's screen. I can't tell the wings' details. Attached is a version of your CIspireseraphine.tga that I edited to be more pleasing to my eye. I used Gimp's HLS function, chose yellow, and decreased both L and S. I also increased contrast a bit, to bring the details out a bit better. Raptors are good, and Raptor Legionnaire looks VERY, very good!
You could easily make all attack sprites look much better by moving them forward, and/or up, by a pixel or two. Then the Caelians would seem to move out towards the enemy.
It's also a bit distracting to see the all-new wing colors for Caelians, but at least this way we can tell the two non-raptor tribes from each other.
Also, CIspireinfantryaction.tga and CIcaelinearcheraction.tga are bad. You can see the top of the base sprite's wing to the right of their heads, and those don't belong there.
I like the three different Seraphines, but the poison resistance on the Raptor is quite odd. High Seraphine is also strange. The fire shield, mountain survival and stealth are useless on her (they're supposed to be too rare to go stealthing around), and Spire Seraphine's 50% fire/25% shock res is better than her 25%/25%/25% elemental resistances. Poison resistance is again just odd. I think you meant her to have Holy 3, because currently she's just a Spire Seraphine with low stealth and fire shield.
The three different Seraphs work VERY well. Nothing bad to say about them.
You shouldn't try to replace the base troops if you don't have to. The same goes for sprites. There's no need to create new archer graphics if you don't want to, because the old Caelian Archer and Blizzard Warrior graphics are unused.
Blood Armor's poison is useless against undead, and I don't see any connection to Caelum. Don't use a fancy modding command just because you can.
In fact, dual-weapon fighting is useless against undead. The troops should have staying power against a horde of undead and let the priestesses banish them. Normal troops should have shields, perhaps kite or tower shields. Raptors should have shortswords instead of spears if they are legionnaires. In general, everyone could use a bit better armor if you intend the melee troops to be used at all. Plate Cuirass (14, -1, 2) is one possibility, and would be very close to Plate Hauberks the heavier legionnaires use. Also, PLEASE give all the melee troops Javelins! Finally we have a way to keep the Caelians in a formation, so that the whole group attacks the enemy at once! Even better, if they are on Hold&Attack and enemy reaches them before they're out of volleys, they back row will move to surround the enemy!
There's no command for airshield, but you could make a custom shield with very high parry value and a rather low protection value. Shields' protection doesn't affect their ability to block arrows. It's only affected by parry. "Amulet of missile protection", prot 1, parry 7, def 0, enc 0...
You would have to give a custom #bonus weapon if you wanted them to be able to use two other items, be it two weapons or a weapon and another shield.