TrinityCore/TrinityCore — Issue #4866: The Purification of Quel'Delar 
Author: Albis
Created: 2012-01-17 18:21:27+00:00
State: open

The quest is not scripted.
http://www.wowhead.com/quest=24596
http://www.wowhead.com/quest=24598
http://www.wowhead.com/quest=24594
http://www.wowhead.com/quest=24564
http://www.wowhead.com/quest=24595
http://www.wowhead.com/quest=24553

All you need to do is:
1- Talk with the Warden of the Sunwell.
2- The Warden will teleport you to SOLO VERSION of sunwell, There is no hostile npc, No Boss, only friendly players.
3- Use Provided Item on sunwell.
4- After a text event, loot the sword.

I Couldnt Find the map area of the solo version of sunwell, tried wowhead but it is same as "Sunwell Plateau" Instance. any idea?

And it is the last quest in Battered Hilt Quest Line, making it possible to obtain quel'delar weapons. (Also The Halls of Reflection is bugged, that one may be easy to fix with sai)