OK, so I've prepared Chain of Eyes, Disguise Self, Know Vulnerabilities, and Detect Thoughts to help with infiltration/information gathering. Dirk also picked up Darkstalker to make him more of a sneaky bastard.
So what I'm thinking is I sneak up and try to get Chain of Eyes on someone heading into the camp, and then we wait while they pass the "sensor" around for a while from person to person to gather as much info "remotely" as I can. I'm not really sure how to land this without being caught, as the range is touch. Maybe I could cast it on one of you guys (and you voluntarily fail the save), and then you go to the camp and pretend to be a lost traveler or some nonsense, and touch a guard before you get kicked out?
Then after we take a look around, we can hopefully get a better idea how to use Disguise Self in the best way to get close enough to their "fearless leader" (without suspicion) to hit her with Know Vulnerabilities, and while I'm there I can scan around with Detect Thoughts to try and see if I can learn anything about this group, her, and their ritual that we don't already know. If Dirk is sneaking around in their camp, I'd appreciate it if you guys were nearby, in case anything bad happens...