I was wondering who you guys would consider to be the greatest spellcaster to ever exist in Tamriel's history and why. And somewhat related, what is the greatest individual feat that any mage (or even group of mages) has performed? I was just curious after reading up on some lore about mages like Divayth Fyr, Shalidor, Sotha Sil, Zurin, Tharn, etc. I got curious about the feats because I wanted to see just how powerful magic could be in Tamriel, such as with mages traveling to Daedric planes, the Psijic order moving entire islands and whipping up storms to destroy the Pyandorean fleet, etc.
So, in your opinion who is the most powerful mage in Tamriel history and what is the most epic feat ever performed by a magic user?