The Mother Cyst feat grants a line of really cool, nasty spells, all of which first require implanting a necrotic cyst in the target. Once you've got them encysted, you can find them anywhere, inflict damage on them that can't be fully healed, use a spell that works like dominate person but with fewer ways to protect against it, and even turn them into a skulking cyst.

So, my question is - can you think of any way to grant Skulking Cysts the ability to determine which people have & do not have cysts, so they can be ordered to attack anyone without a cyst? I suppose I could simply place all cysts on the same spot where they can be deliberately shown to the Skulking Cysts (say on the arm just below the wrist, so they roll up their sleeve to reveal it), but I'd prefer something more slick.