Perhaps the alt-grade version will be some kind of dark/night Simurgh? (purple or even black in color...)
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Do we need Ashan?
This is closer to Necromancers, considering they worship Ashera, but in a very distorted way.
However, a dark Simurgh might have an indirect connection to dark elementals...
However, what's wrong with a purple, nocturnal Simurgh (if the name is changed)?
However, what's wrong with a purple night simurgh (if the name is changed)?
Added 1 minute ago
And it also seems too similar. Simurgh and Shadow/Night Simurgh.
"Twilight Angh," "Dark Finist" (or something similar :()
...
"Tenekryl"?
"Herald of the Night"?
Indeed. Perhaps something like:
"Gloomy Angh," "Dark Finist" (or something similar :()"
...
"Tene-wing"?
"Herald of the Night"?
Added 4 minutes later
Although "Herald of the Night" seems like a good option. And give it invisibility :D.
Alternatively, you could give it some kind of cursing aura that weakens the defense of enemy warriors.
Quetzalcoatl – more like a reptile.
Perhaps Quetzalcoatl?
Or maybe the Heralds of the Eclipse? After all, night happens every day. But an eclipse happens once every few years, and it's a grand event.
(from the wiki: Simargl is an ancient Russian pagan deity with unclear functions, included in the pantheon of Prince Vladimir. According to most scholars, it is a semi-divine character, possibly a messenger between the heavenly and earthly worlds (like its supposed Iranian prototype, Simurgh). According to B. A. Rybakov, it is the patron of seeds and roots, the guardian of vegetation.)
However, you'll have to come up with different abilities.



They even had a Void cult that created the Staff of the Underworld.
Or, you could create another bird based on primal magic, but with a different color. Judging by the images, there are three main colors: green with rays or smoke (dispels magic), purple with lightning and fog (affects the mind), and light blue with rays (deals direct damage).