[quote=@Dr Acula]
How easy would it be for a demon to pass themselves off as an Angel born? Like could you realistically infiltrate their ranks? Demons are eternal right - if one wanted, say, to play a strategy game rather than a straight up kurder game and rot the angel born amd knights from the inside out? Or even pose as a Knight to protect the charges only to turn on them in the field kind of thing? Or would the propehts etc be able to sense their demonic essence?

Also, is there any like... formal magic that the knights use? Like angelic script/runes for inspiring bullets etc?
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I'm so sorry about the late response. For some reason I never got an alert about getting responses to my post here. 

Anyways, to untrained Angel born, demons could easily pass themselves off as a fellow angel born or prophet but once they try to incorporate themselves into the main group, I can't imagine it would be possible. The prophets would probably sight them out within a few moments of them even trying. They probably could trick the humans and maybe if they somehow sealed their demonic side down like, completely, then maybe? But I can't imagine a demon possessed willingly dampening their demon side to insert themselves into enemy territory essentially defenseless but if you want to roleplay that, have at it!

As for the magic, yeah. You can use anything from any kind of religious lore like blessings, runes, scrolls, ect. Have fun with it. Just keep in mind that godmodding and powerplaying isn't allowed, as always.