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What other Legions aside the Night Lords has a supply of/ regularly uses Raptors? I was thinking World Eaters or Alpha Legion, (sneaking behind enemy lines) and probably the Black Legion as they consume other forces.

I imagien Emperors Children migth use them, and while bot a legion I think Red Corsairs use them if they have the chance, with them beeing pirates and all

Black Legion has a large number of Raptors, along with every other kind of CSM. I remember there being talk of Red Corsairs frequently using them in Imperial Armour.

Otherwise you don't really see them in fluff much. Most Raptor units are elite shock troops which pawn themselves off to various CSM warbands.