The Longsword of the Blacksoul

The Longsword of the Blacksoul is the soul reaping sword wielded by Thel-Kaaden. Not much is known about its origions but you understand that the Jewel at the end of its hilt is what is containing your souls. You also know that he plans to use the souls to perform some kind of ritual called The Mass Geas which has somthing to do with large scale mind control.