Oh yaaa lets buy a 25 dollar DLC only about Lava. Lava has been in some form in almost every single Elderscrolls, look at oblivion, there was lava in the Oblivion realm. Lets make another horse armor plug in next.
I didn't mean it was going to be literally based around magma/lava, just that it might have something to do with it. For example, maybe the player could find himself going underground or into some Oblivion realm with it. If the magma is a clue, it's better than nothing. At least it could spark a little speculation (which was the entire point of this thread).