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Can't seem to find the specific quote I'm looking for but here's some excerpts from Watchers in the Throne.
Thee Emperor made the Custodes to be the best of the best, but he didn't rely on them to fight. He designed them to be part of a greater whole, to command and fight alongside mortal troops just as they had when unifying Terra.
That's a model I hope we can follow with the 2nd.