((Don't worry Ryze I got a question))
In the field you collected information about everyone's magical power who do you think haves the strongest magic of the mortals meaning by not people who uses the Void, People like Brand, Xerath, and etc.
Ooh, that's a toughie.
Well, I know that your personal power is not short of excellence, but it's almost certainly not the absolute most powerful thing in existence. I've often found that, while not necessarily the most powerful of magic, magic granted by 'deities' or 'ethereal bodies' is certainly a desolating aspect; instant mastery of an entire branch of magic? Even Nomicons do not have that power, at least in my experience.
I would have to put my personal bet for 'most powerful magic I've encountered excluding non-mortals' somewhere around Diana and Leona. If we could find a way to harness the power of darkness itself into pure energy, then I think that would find the perfect balance to create the ultimate power.