Most powerful magic user in league?
Just wondering based on their powers what champ is packing the most punch when it comes to spells?
Looks like the top contenders are 
and 
Runner ups are 
154 Comments
It's between and
Veigar corrupts the Cosmos Themselves, can use your own magic against you and can conjure Dark Matter. Dunno where this Black Hole stuff is coming from though...
Xerath has destroyed an entire civilization and achieved Immortality through Transcendence. He's literally immune to physical attacks.
Syndra HAS A FLOATING MOUNTAIN ABOVE IONIA MAINTAINED SUBCONSCIOUSLY. Her magic wasn't 'Learned' from anyone, she was Born with this power
Bard Transcends Reality Itself and is responsible for ensuring weapons like The Egg are not misused (which he kind of failed at in a sense, but still)
Honestly I'd give it to Syndra but the others are extremely powerful in their own rights.
Lore-wise? Probably veigar.
Since you posted in Story and Art I assume you mean lore, not gameplay.
Before Xerath got retconned, he was the main candidate. Now?
Born with the gift to control the very magic essence of anything and anybody with just a thought. Can maintain her creations seemingly indefinitely, surpassing even Ascended beings, such as Azir who can barely keep sand together for a moment (Shurima was buried under the sand, he didn't create it anew. He merely resurfaced it.)
Lorewise?
I mean, sure that has a lot of raw power... but the destructive power of the Veigar's Spells is insane (Literally).
Veigar can create blackholes, summon meteor storms, meteors of dark matter, swallow souls, absorb magic, use magic of his enemies, corrupt the cosmos itself... did i mention The Black Holes?
Comparing an arcane storm of lightning bolts vs blackholes and meteors... Im pretty sure that the blackholes win.
_ "Unimaginable is the power of Veigar!"_
Death Fire 
Truly the most magnificent wizard.
Hm...
Is a trans-dimensional being capable of moving between realms of reality.
Is an ancient spirit of flame from before even the Rune War.
Is from a whole other plane of existence, no one knows where he came from and what he's doing in that room when no one is watching. Not to mention, that ult has to be taken into consideration, it is beastly.
He's a Lich... ._.
I mean, she does have her own floating mountain...
He plays with time and space like they are toys...
Chronomancer... nuff said.
Alright, I'm confused. Neither in Veigar's lore nor in his abilities does it say he can summon a black hole, so where are people getting this "black hole" rubbish from? If they're getting it from that line "a corrupter [and thus controller?] of cosmic energy", I suppose that could make sense; it's a little vague. But I took that more as an explanation as to why he can "bend the edges of space" around a person to stun them (with his e) or summon dark matter (with his w). Let's not forget that black holes are currently believed to form from a dying star imploding, which I don't think really constitutes as 'cosmic energy'.
As for the question, if not veigar than definitely . It actually says her magic powers grow by the day, and if we look at her passive(transcendent), she managed to "transcend" like azir and xerath, but completely on her own. So even if she isn't as strong as veigar now, who's to say she won't be stronger in the future.
is a literal god whose purpose is to take care of the balance of the entire universe, no contest.
Got hit by the retcon bat, but he is still quite powerful, being apparentely immortal and capable of taking on both Nasus and Renekton. 
is another amazing mage, who considered himself to be more powerful than pre-retcon Xerath. He doesnt seem particullary arrogant, and his actual knowledge on magic is unmatched, so it is worth checking.
It is specifically stated that 
could free himself from the Summoner's grasp whenever he wanted. I strongly doubt that power steems from his physical strength, so i could see him being quite a potent magic user. On a similar note, 
is also stated to be stronger than the Summoners (rip) and is actually held back by his armor.
Was stated to be one of the most powerful magicians in the entire planet by a high ranking summoner, at the age of 8. Her potential is not only amazing, but the sheer control and understanding of her magic are incredibly high. Whereas Syndra is all about potential, Annie's affinity for magic seems to be high on both potential and actual talent.
Has the potential to be incredible, but she is too arrogant and doesnt understand her own power (Red statement). Even if she has the highest magical potential out of every mortal (Which is possible), she is unlikely to ever reach it until she changes her current mindset.
All we have for is his in-game power. His lore notes that he is ''A powerful wizard in his own right.'', which doesnt inspire confidence in me when it comes to the likes of Xerath and Syndra. Even then, we know Veigar has been failling to achieve his goals, with Tristana herself making it quite clear she sees the Tiny Master of Evil as nothing more than a joke. Even if he has the potential to be the most powerful magician of all (Which i doubt), he is by far the most incompetent magic user in the game, so i doubt he would reach said power.
Can beat just about everyone, due to the nature of his powers. It is unknown how well other, more powerful magicians can resist his control, if at all. Sorta reminds me of Avatar's blood bending.
I'm a little biased but I'd say 
is up there. We actually don't know for certain what his true strength is, since he's so mysterious, but I have enough headcanon to justify him being one of the most powerful mages in Runeterra.