This must have been at least two years ago, but there was this one manga I was reading that I lost touch with and am trying to find again.
The story is the usual "guy is trapped in a video game and is looking for a way out". I'm pretty sure he has admin rights for the game. I want to say all or most of the people in the world has the power to control one element to some extent. He had a chance encounter with some nameless warrior and greatly enhanced the guy's sword. The nameless warrior turned out to be a king of the normal people who were thought of to be powerless.
One situation I can remember was where he generated a giant tower in the castle town and I think the princess took a fancy to him. The army recruited him and he had to go to one of their borders and create a new fortress for them.