Ok, so I will edit that into my sheet later [@Maxx], as I am kinda busy at the moment.

Ok, [@amol_kotay], I don't recall ever saying that Claymoor is a human. Ever. So, why exactly, would he have to have the consistency of human flesh?
His cells are not like human cells, and can do tons of things that ours can't, such as increasing internal pressure, which makes him stiffer. 
On top of that, his cells have much stronger membranes, so the turgor pressure can be quite high, allowing him to make his cells very rigid.

Where did you get the idea that he can turn into anything with a higher or lower mass than he currently has? Claymoor is supposed to be more sci, and less fi, I wouldn't do something stupid like that.

I am going to give you an example that is similar to Claymoor. Imagine you have a magnet factory, and it makes special magnets that can absorb water to swell up, or dry out to shrivel up. These magnets can be shaped into whatever you want them to LOOK like. They never stop being magnets.
You may decide to make your magnets look like a lamp, but the lamp will not turn on. You can run a wire through the magnets, and add a light bulb fixture to the lamp, and plug it in. now you have a lamp (shape) with a light bulb in it. 

The factory can make more magnets if you give it more iron compounds to use. The magnet factory can recall some of its magnets, and recycle them, storing their raw materials for later use, or just dumping them out.

Ergo, the magnet thing can grow and shrink if you +/- water, or by making more magnets, and shrink recycling some of the magnets

Claymoor does not have a cell factory like in the example. His cells divide just like normal, except into 3 instead of 2...