Scorpions - scarabs - strange upgrade - these are two different creatures.
Wouldn't it be better not to repeat the mage faction and copy mages and genies?
In general, you can look at the link to the guide for the game I mentioned: http://aow2.clan.su/index/units/0-78.
Pilots on flying carpets? The idea is original, but can it be presented differently? Let them be Rukh riders instead.
But then, let there only be camel riders.