NCF – Extended list of Neutral creatures.

I want to try and guess, will there be spiders on level 6? And on level 7, will there be any Black Dragons?

If I make spiders, the Free Cities will fall into darkness :D
Spiders are more suitable for Necropolis; I'm considering these options:
1) Barbarians - nomads (cavalry) and ballistae (originally, I was developing mercenaries, and these units fit very well)
2) Thunderbirds and super air elementals (both units are more suitable for level 8 as bosses)

3) A combination of a creature from 1 and a spirit from 2.