Speak with Balthule Shadowstrike near the Tower of Althalaxx.
Before confronting Athrikus, it would probably be wise for you to consult with Balthule. I have no doubt he has been vigilant in his watch of the Tower, and he may have information about recent developments.
Ah, it's good to see you again, <name>! The strangest things have been happening around here, I'm glad you showed up!
It was very strange, <name>. Everything seemed normal--well, as normal as things get around here--and then suddenly there was a blinding flash of light from the upper room of the tower. Then came the screams. The cries split the air, and lightning struck the ground from time to time. What's going on?