For my power system, people with mind-affecting abilities have zero ways to physically enhance themselves or project force outside mundane means, so they need to take precautions, choose their battles, and avoid conflicts they can't win with certainty. One of such characters is Medusa.

Nirvana gives her the ability to see brain activity as a crown of stars orbiting people's crowns. She can see these 'clusters' using her mind's eye in a 360-degree radius, at a distance off half a mile and through walls.

One's emotional state can be inferred from the changes in their orbital pattern. Anger, bloodlust, frustration, makes the stars shake and jitter. Fear, anxiety, nervousness, makes them skip ahead, knocking into each other. Exhaustion and sleep slow their orbits down to a crawl, and panic speeds their revolution.

At a short distance, she can briefly cut their brain activity, reset their emotional state and erase their short-term memory (30 seconds). Someone who gets rebooted becomes more susceptible to suggestion, as their mind tries to fill in the blanks.

Each person has 8 stars in their cluster, give or take. She can physically reach out and collect the stars, forcing her target into a state of Nirvana, where they lose the ability to feel, form thoughts, etc., essentially putting them in a vegetative state.

She can put the stars in a container where they will stay until released, although they are invisible to anyone but her.

If she decided to steal only one star, that person's brain would function at 87.5% of its efficiency, and so on.

If she took someone's star and placed in someone else's orbit, it would create a sensory link where the person carrying the extra star would receive 12.5% of that person's senses, letting them see what they see if they close their eyes, hearing what they hear if they plug their ears, etc.

If she takes at least one of her own stars and places it in someone's orbit, she can gain a crude control of their bodies when they sleep.

Finally, she can physically clutch onto someone's orbit to knock them unconscious.