Help needed for challenge game

[Endoperez]

Tien Chi PD has Glaives. They can kill non-ethereal Wyrm unless they rout.

You can have any Acid spell, so (some of) your spells are unresistable. Masters of the Way are inexpensive, have Water, and Holy magic. Good researchers that double as THE anti-Ermor unit.
Evocations are good. Celestial Master can access the Acid spells, Magma spells, Water spells, Astral spells, Astral Fires, etc. There's lots of goodies in there. As mentioned earlier, you don't have to worry about Magic Duel that much.
You can recruit various kinds of archers, infantry, cavalry as Tien Chi. The light cavalry might not be that useful, but other than that they have anything you could want.

I haven't really considered this for long, but I'd go for Evocation to boost your magic, and Air-based pretender to give you something your enemies will have harder time countering. E.g. Air6F4 Phoenix could get you nice Air Evocations, and might give you an Air Queen or two. You might want to have Titan and leave Fire out, as Fire Darts isn't very feasible before higher levels in Fire.
Earth could also work. Reinvigoration for your mages, slap in some Fire for heavy-damage Magma spells, some Air for Mirror Image/Mistform if you're doing a combatant, and that combination would also let you summon Celestial Warriors (IIRC).