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And who are these "preachers"?
Raider griffons, battle griffons, assault griffons, imperial griffons...
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It would be better to use the term "chaplain" instead of "preacher" - chaplains were military priests.
Raider griffons, assault griffons, battle griffons, imperial griffons...
And do your red griffins, like in the original, have the ability to attack everyone in a line? Then you could call them "Rukh birds." Remembering that these birds tend to lose their steel feathers in flight, thus injuring people. I don't know how lore-friendly that is for Ashan, though.
Why not others... They might have the same griffin-like body structure. If it isn't forbidden by the Ashan lore.

In WGE, they are called storm griffons.
What if some fiery/swift/ardent ones?