KIll a crusader in the citadel
It is at shadowfall in the evil shop,it costs 50000 gold
helm of the dark lord
you can get his sword, cape, and i think you could get his armor and helmet.
on the adventure quest worlds wiki
There is a cape that gives the quest for the set...
Go to the shop
corner486
I dont think you can get it.
citadel
do his quests
thirteen1
Adak in northlands