Corruption
Find the Black Guard Swordsmith in Stratholme and destroy him. Recover the Insignia of the Black Guard and return to Seril Scourgebane.
Insignia of the Black GuardDescription
If I am short with you, it is for a reason. The plans for the creation of the great blade, Corruption, have been stolen by the Black Guard: Elite skeletal units of Baron Rivendare.
Yes, Baron Rivendare of Stratholme.
The Black Guard swordsmith now guards those plans with his... undeath.
Slay him and return proof of this deed and I shall train you in the ways of the swordsmith.
Progress
Have you forgotten what it is that you were tasked with, <name>?
Completion
It should be obvious that a sword is always the best choice.
Plans: Blazing Rapier
Master Swordsmith