Hello! Thank you for the compliment. I believe you have to kill all of them, and they have a nasty habit of going invisible(I'll see what I can do in the next version). Have you tried going there with a True Sight? You also have to pick up the wardstone, since you will need it.
And Global("O#LLKimmurielTasks","GLOBAL") should be less than 4, but that's probably correct.