Our Imperator
I think that's really ambitious, a bit of a big deal. Is it a secret you actually *know* that you don't share with anyone else, or is it a secret you technically 'possess' but don't actually know (It's locked in a box you've never opened, or written on a scroll you can't read, ect) and you have to protect it. Those are two fairly different flavors of keeping a hidden secret.
The concept is good, but a secret that big should have serious consequences if you misuse or let it slip. I personally would prefer it not be that big, especially if it's something you plan to 'know' in play, but I don't object if others are onboard with it being Cneph's secret.
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I like her as Dark, but I'm not opposed to a Hell/Fallen Angel Imperatrix. I am Hell Code, but a variant.
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So , HG, the idea of her playing with Luna's heart is a good one. I was thinking of taking a bond or affliction to reflect it. Luna definitely feels stuff about her, and a few projects will definitely lean into growing that relationship between them I think.