Dream Manipulation
Dream Manipulation is the power to influence and control dreams.
This is an ability that can vary greatly in complexity and power, with the simplest application merely altering dreams with no direct effects.
However, the real, powerful users of this ability can use it in a variety of ways. Some can travel through other people's dreams and use them as a means of communication or even as a means of attack, attacking other people in their dreams and potentially affecting them in the real world.
The greatest users of this ability can completely control the world of dreams as another plane of reality, playing with it and altering the dreams to suit their whims; some are even able to pull others into the world of dreams to kill them or imprison them within its confines.