Other than the old gods. technically under azeroth's....surface :P
who is the most powerful being on azeroth?
(hint: totally me)
Millhouse Manastorm. All the people saying Azshara have no idea how powerful this gnome *really* is.
As a mage I support the use of Alter Time during any and all physical intimacy so that your bedroom looks like an unshaken snowglobe at the end.
I've got more jokes like this, druids and entangling roots next.
Back OT, people aren't citing reasons for *most powerful being* Malfurion would be up there. Elune perhaps? Malfurion has accomplished many great feats, while Elune has vast powers attributed to her.