Did you know that all living things contain water? Isn't that pretty neat? Well, you can make "living" things with magica, but those don't really count. Some do I guess. But yeah, even Demons and Angels have water in them! People don't think about that, very much. No matter how strong you are, if you don't have water in your body, you aren't going to be doing much. And what if that water wanted to do something you didn't tell it to? Not much you can do about that, either.
It's a fun trick, to be able to manipulate water. And things containing water. Takes a lot of effort to make balls of energy materialize without fuel, but moving some water around? Oh that's so easy! And fun!
-Journal, in cursive, of the Demon Master Sangui