Unless you are walking up to someone and blowing powder in their face, I find it doubtful that one would exist. The mindset that many people have that spirits or magic do not exist blocks them from being able to really pick up anything that would tell them “hey, you’ve been cursed by such and such”. If they do, they’ll likely just rationalize it away just like everything else outside the norm. Understanding human behavior and pointing stuff out that makes others think you can rear their minds (therefore know all their dirty secrets) is far more efficient if scaring the enemy is the goal. Applied knowledge is one of the many forms of power out there in the world.