Your power is dependent on how well you adhere to the yin and yang of your current society. Just as you have your own yin and yang assignments, so do all the other beings of this vast and wonderful universe. Because of this, as you happily kill/converse/sex0r your way across the galaxy, what you kill/converse with/sex0r will change the balance of your yin and yang.
If you are nice to beings of the same or similar yin and/or yang, your power will increase. Conversely, if you are nasty to beings of the same or similar yin and/or yang, your power will wane.
Similarly, if you successfully attack beings of a yin/yang that is opposition to your own, your power will increase.