When sneaking in to the cellar, make sure you go down the east set of stairs, the west one is a large empty cave which does not connect to the correct east one.
Quest
Blood of the Betrayer
Quest facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
If you go down the stairs and in to a cave with no npcs you are in the wrong 'master's cellar'.
Simply turn around and head back up the stairs. Across the pathway on your right hand side the correct location.
Came here to find coordinates, and struck out, so here they are.
Entrance to the downstairs part is at 48.7, 78.9
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(30109))
Description
I've pinpointed Nalice to the Master's Cellar, an extended basement you'll find in the ruins up ahead. Dragon cultists are everywhere, and Nalice has set up some strange arcane storage devices throughout the area. Perhaps you can use those to your advantage? Sneak past the cultists, obliterate Nalice, and grab a vial of her blood for Wrathion. I'll keep my eyes on you and pull you out if you get into any trouble. But I'm NOT coming in there with you!
Community notes from Wowhead · 53 comments
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Reward details
Reputation: Ravenholdt +500
This guild of thieves and assassins welcomes only those of extraordinary prowess into its fold. Sworn rivals of the Syndicate.
Reputation group: Classic.
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.