Megakreon the Unbreakable
You kill this enemy at the end of Theatrics and Espionage quest. Start this mission by speaking with Darius near Patrai.
Go to the theater and speak with the man sitting in the auditorium. He is easy to spot – the man has long bright hair and is sitting alone in the first row. He tells you where to get the documents. Go back here after you get the documents.
You are attacked by Megakreon. Kill him to complete the quest. You are accompanied by Darius – the man will focus the enemy’s attention on himself.