Elemental Forums
This quest did not end after I finished it. I got the Quest Reward - "Have the Assassin's Blade" after killing all the people it asked me to, but the quest is still showing up in my HUD. I'm not sure if I got XP for it or not.
To properly end the quest, you have to go back to the starting location, with the blade in your inventory (NOT equipped, or it won't be recognised). The quest description doesn't explain this, which makes it hard to figure out why the quest is still active.
A bit of an odd bug, no?
Imo, the item you should pick up from the quest should not be equippable UNTIL the quest has finished. Else, the quest should reconise your equipping of the item when the quest ends.
It is a really good quest though. 
OK, I went back to the original quest location. First when it "awarded" the Blade to me it now required level 18 when I had been equipping it all along. Also - and more importantly, the game deleted the Assassin's Blade from my inventory.
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