[@Pathfinder] Most of this will be explained as I make The Elemental King.

But the big difference between Element and Power is and element, say Light can do everything you can think of with Light based powers. Such as healing, moving through the light, bending and controlling the light, etc. 

The powers are powers that have no connection to the Elements. Nobody in the world has powers except those who are destined to help the Elemental Chosen Ones and the Elemental Chosen Ones themselves. This will be explained in the Elemental King's backstory. 

An example of a power is Bone manipulation. It has no connection to any of the Elementals. And just seems to be a non Elemental power.

For the Elemental King, as it will be explained in his character sheet, he rules with fear. He kills every child and newborn baby he can find in the world to try and stop the Prophecy from coming. He rules the majority of the world except for one or two places he has yet to conquer. If somebody disobeys his law they are executed. However if you keep to the law, not have children and pay the protection fee, you will be safe and his guards will make sure of it otherwise you are ignored by guards, nor they or he will help you or he may have his guards kill you themselves.

How's that?