In RMSS, there is the Enchanter profession in the Mentalism Companion, which is an essence/mentalism hybrid. They create illusions that are purely mental, either "seemings" which are simply illusions or "overlays" which alter how a real something is perceived. These types of illusions have no size limits, but the target has to be in range and can resist (since it's a type of mental attack), and often they only affect a single target (but not necessariy, since this is a hybrid and not a pure mentalism profession). But since no one else is aware of what that person is seeing, there are some usefully subtle things you can do with it. E.g. two people can have a conversation where one of them is hearing something totally different.