I like to explain things when I really don't have to. I too much the brains. Let me make it simple because the how is not as important as the what. 

He can absorb matter and then use that to create new matter. The material he can create is dependent on him having absorbed it once before. He cannot create more than he has taken in. Nor can he create mechanical or complex things at once. As a result they tend to be simpler constructs like tools or weapons. The denser the material the longer it takes to create. His powers do not work on living things.

[quote=Saarebas]
You know what if you think you can use that power without getting OP I will let you have it, but no controlling another person's character alright, that sound fair?
[/quote]

I would stipulate, without permission.