Sword Art Online S02 E16 The King of the Giants

"Blurring the line between the virtual and the real."

Kirito and the others are tasked with subjugating the Frost King Thrymr, and a quest to recover Excalibur. It's Yui's guess that this isn't a quest planned by the game admins, but something automatically generated by the system. And if that's the case…