You can go back to Drakaru in the cage at Granite Springs (16, 47) and he will give you a new elixir.
Quest
Cleansing Drak'Tharon
A World of Warcraft quest in Drak'Tharon Keep. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Was anyone really surprised? "Oh hey, Mr. Troll-locked-in-a-cage, I'd love to make a blood pact with your using this dull knife. Instead of my own ax or sword, both of which probably won't give me tetanus. Then I'll run around killing buttloads of trolls for their 'mojo' and then give myself spirit visions using some kooky elixir you just mixed up, as that sounds completely safe as well."
Oh how could that possibly have gone wrong?
So I figured I would comment, since this one confused me for a bit.
This one is for the instance, Drak'Tharon's Keep.
You can get the Mojo inside.
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(12238))
Description
Drak'Tharon soon be cleansed of them foul undead and restored to her noble purpose. In return for your help, the keep's most valuable treasures be yours, mon! Once ya be reachin' its top, ya must summon me, and I'll perform the ritual. Alas, my summonin' will be comin' at a cost. Ya must collect mojo from the survivors.
Getting there
Inside the dungeon: Drak'Tharon Keep
Drak'Tharon Keep once served the Drakkari trolls as a formidable outpost at the edge of their kingdom, Zul'Drak, but a recent Scourge invasion has delivered the fortress into the Lich King's hands.
Bosses in the Adventure Guide, in order: Trollgore, Novos the Summoner, King Dred, The Prophet Tharon'ja.
Entrance: Drak'Tharon Keep, Zul'Drak at 28.4, 86.9.
Instance text, bosses and entrances are the client’s Adventure Guide data.
Community notes from Wowhead · 130 comments
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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.