Maybe make the color like the green dragons?
Posts from RTF is a global modification that replaces all towns in the game.
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Do we need Ashan?
Or maybe the Rukh (lightning) birds? Blue and purple coloring, something similar to the Obsidian Giant's lightning chain. Effects like storm petrels + a warlock ability with approximately 40 mana units and spells: lightning, lightning chain?
I think it's an interesting idea... Have the developers already described the Rukh birds in Ashan? If not, then it could definitely be added. Suggestion: not as birds of thunder (this is an idea from the third game, quite unique), but as those very birds with iron feathers from myths, perhaps as bird-golems. Like a living airplane. Well, it's up to you in any case.

The Spirit World is divided into elemental worlds, each of which is inhabited by special types of spirits and elementals, the most powerful of which are dragons. The Thunder Bird, known in the writings of the Seven Cities as the Rukh, is one of the greatest spirits of Air. Being bound to the material world, the Thunder Bird causes storms and hurricanes with each flap of its mighty wings. Most often, the bird is summoned by mages or priests of Ilat through a complex ritual, but sometimes a Rukh egg appears on its own in a place where lightning has struck the ground.
it was a superboss, but after defeating it, it turned out that the Rukh can be of any size and strength, even tiny little birds.
Hmm, my bad, it seems everything is already defined for them... That's a shame. (It looks like if we're going to create an iron bird, we'll have to call it something else.
An iron bird doesn't really work as an upgrade for a Simurgh. It's the same as making a Gnoll an upgrade for a Wolf.