Get Destruction to 100, talk to Faralda in the College of Winterhold. She'll give you a book with riddles in it, which will point you to 3 locations. At those locations, put the book on the pedestal, hit it with its respective spell (there's a pedestal for fire, ice and lightning). After all 3...
The Elder Scrolls V: Skyrim!
I'm in love. 88 hours played in 9 days. Getting ridiculous.
Charging a Lightning Bolt while my Storm Call throws down lightning on a dragon, amazing moment.
Charging my Fire Storm, Master Destruction!
Two dragons? CHALLENGE ACCEPTED.