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I didn't touch the city buildings because I want the unit to be compatible with the current mod and the vanilla game, and there the buildings have different model values – so for now, I'm not touching the buildings.A simple Rukh is weak; it should be cheap and easy to build, while the upgrades should be expensive.Tier 4 remains; perhaps it's worth trying to make a Stone Lizard because Tier 1 and Tier 3 aren't particularly fast, and the lizard could have a speed of 5-7 points.Alternatively, we could move the Mage to Tier 4 and make Tier 5.We could also consider the Golem – make it a Numidian that not only attacks but also casts various spells.This is just a recolored Phoenix of Zahar, with modified effects, and there's also a new effect for attacking a unit.
Rukh – Gamayun
Snow Eagles – Gveihir
Thunderbirds – Stormbirds