Isaulde could know the Grey Knives - actually, she could've even been one of them in her youth, because before becoming a Dark Knight she was part of an unspecified criminal group, and she is a Duskwight to boot.
However, while she tends to protect the lowborn from the corrupt nobles, she'd also protect the highborn (if she feels they deserve it) from the lowborn, if it's needed. She could be either an ally or an enemy for the Grey Knives.
However, while she tends to protect the lowborn from the corrupt nobles, she'd also protect the highborn (if she feels they deserve it) from the lowborn, if it's needed. She could be either an ally or an enemy for the Grey Knives.