You do not need to be in a raid to do this portion of the quest. Once you have accepted the quest, talk to any of the NPCs around the quest giver to be teleported into the Sunwell Plateau raid instance. When you are inside, you should see the Sunwell, down at the bottom of the spiral slope (you really can't miss it). Just go down, and click your tainted blade next to the Sunwell. It will kind of suspend there in mid-air.
At this point, the two NPCs will start a dialogue, and at the end of the dialogue, you can click on your suspended sword to pick it up again. There's actually a port to Dalaran available at the side of the circular area, so don't bother hearthing. You do, however, need to fly back to the Argent Tournament area to turn in the quest before coming back to Dalaran again, though.
The phasing of this portion of the quest is very interesting, as most of the isle has been taken back. Except the naga along the coast line, who were left to torment the murlocs there.
Quest
The Purification of Quel'Delar
A World of Warcraft quest in Sunwell Plateau. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Note that this quest comes from the end of a long chain asking you to go everywhere and do everything. Always.
It starts with a Battered Hilt, which is a drop off of mobs in either of the Icecrown Citadel 5-man instances.EDIT: added a link Battered Hilt
This seems to have different scenarios for different races. I just completed this on my blood elf hunter who was welcomed to the Sunwell and cheered as he purified the blade, and hailed as the one who would avenge the fallen of Quel'thalas.
Guildie of mine just finished it on her troll hunter and as soon as she got close to the Sunwell she was frozen in place and Loth'remar tried to claim the blade from her, but was unable to as the blade chose her.
Interesting differentiation of events.
At a glance
The Purification of Quel'Delar is a quest for level 25-30 in Sunwell Plateau. It rewards 1 reputation reward.
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(24594))
Description
The Sunwell and the end of Quel'Delar's exile await, {name}. You will find Lor'themar Theron, the regent of Quel'Thalas, and Grand Magister Rommath standing within. Be wary of them and do not allow them to entrap you in their political scheming. Instead, remain focused on your task here. Speak to a Warden of the Sunwell to enter the Sunwell Plateau. Immerse the reformed Quel'Delar in the Sunwell to complete the restoration. Show the blade to Myralion Sunblaze at Quel'Delar's Rest once it is restored.
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Reward details
Reputation: The Sunreavers +500
Traditionally barred from Dalaran, the Horde has been accepted into the city through the efforts of Archmage Aethas Sunreaver. His followers have taken up his name and watch over the ward known as Sunreaver's Sanctuary.
Reputation group: Horde Expedition.
Other quests in Sunwell Plateau that reward The Sunreavers reputation: The Purification of Quel'Delar (+500).
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.
Where this quest fits
Other quests with this name
This one: Sunwell Plateau · Level 25-30.
Steps, storylines and map placement from the client’s QuestLine, prerequisite and QuestPOI data; neighbouring quest text is Blizzard’s own (quest API), shortened to its opening sentences.