Alright, so what I'm trying to accomplish is allowing my administrators to see specific players through walls, but only the admins are supposed to see them. I don't want the target players or entities to have a potion effect, as it gives away that we're watching them. Also, potions does not allow visibility for specific players. I suppose I would need to dig into some NMS to do this, but I have never really been working with reflections and fields before, so I don't even know where to begin. Any tips would be much appreciated.