How about insect people living in a highly structured colony-like society. I would imagine it as primarily infantry-based (some winged) with good priests and strong on sacred troops.
* Swarming tactics would make sense.
* Nature magic seems to fit.
* Lots of Poison sting attacks and poison resistance but with fire susceptibility to offset.
* High morale and even some Berserk for insect-like single-minded purpose.
* Edit: Paralysis/web attacks for more expensive units
- Basic quadrapedal infantry - the real insects
- Basic bipedal infantry - more like insect-men, using natural weapons and armor
- Winged infantry - insect-men warriors in chitin armors and using various hand-held weapons in addition to natural weapons
- Ranged - Some type of short-ranged, poison dart shooting bugs
- Priests - insect-men with priest magic and maybe Nature.
- Mages - Nature, Earth, Air magics
This is all just off the top of my head. I'm sure it needs work...
