Possibly stupid question! If a character were the Archon of Gravity, they'd be able to increase or decrease the mass of an object/person, right? If yes, would they be able to change the mass of a specific part of something, such as giving their fist more mass so they could hit harder? Or would they have to change the mass of their entire body?

Also, question about the Storm Archon. Is that another way of saying they can only control lightning or are we talking all aspects of a storm? (Rain, tornadoes, hail, etc.)