Tip:
They're on the next floor up from the area you first tele into using that cannon.
I believe you need to go north west from the camp, be Invisible!!, and no companions/mercs.
Follow the walls northward until you see a set of levers and what looks like alcoves in the wall. Those are elevators. Stand inside, then get close enough to click the levers.
That will take you upward.
From that point on, to find the consecrants, you will notice buildings to the left and right. I just go right / west and best tip is to head to the last building and look inside.
If none in there, pull and clean out the building, hopefully a consecrant will randomly spawn in there. Do that until you're bored or if you've got enough for the 5 in task.
Otherwise, the other option is to keep checking each building as you go eastward. Hopefully there are some in those rooms.
Best of luck!