Enter Karazhan and search for knowledge of the Pillars of Creation with Khadgar.
Magni's information was enlightening. It should prove handy to have a friend who has the ear of a titan.
It's time to head into Karazhan. Not that I need to remind you, but it can be a dangerous place. There are countless strata of spells woven throughout the tower, and the interactions of the forces within can be... unpredictable. Be on your guard.
I'll join you inside. I need a moment to... gather my thoughts. This place holds a lot of memories for me.