Z'kral has quite the long respawn time (over five minutes). If you see someone else kill him or you do it yourself while you are doing the pre-requisite quest, make a note to take a break before heading back into the mine or be prepared to wait around a small while.
Also, to many of the comments: No one cares what you solo a normal level 62 mob with.
Quest
The Mastermind
A World of Warcraft quest in Hellfire Peninsula. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
The guy is right at the bottom of the mine, easy to find (there is only one way to go) He is a level 62 Non-Elite. If your not careful you will pull him and a level 60 mob, like I did.
Easy enough at level 61 solo
He was pretty tough back in the day, and that seems to be when those comments were posted. Back in 2.0. Sure, its easy to kill him in wrath and cata, but it was a pain in the ass in BC
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(10099))
Requirements
Read from the Blizzard quest API.
Description
Those infernal gan'arg keep scurrying into the mine! For each one you kill, two or three more seem to take its place! There's got to be someone down there in the deepest reaches of the mine directing the incursion. You seemed to do well against them last time, and Light knows you're the only one brave enough to venture back into the mine. Find out who's responsible for this disturbance and make him pay!
Community notes from Wowhead · 33 comments
Top 3 shown aboveThe comments below were written by Wowhead users. They are community notes, not TheWoWDB comments. See them in context on Wowhead.
The top 3 are shown in Top Comments above. Read all 33 on Wowhead.
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Reputation: Honor Hold +250
Vestiges of the Sons of Lothar, veterans of the Alliance that first came into Draenor, have steadfastly held on to this Hellfire outpost. They are now joined by the armies from Stormwind and Ironforge.
Reputation group: The Burning Crusade.
Other quests in Hellfire Peninsula that reward Honor Hold reputation: A Job for an Intelligent Man (+250), Rampaging Ravagers (+250), Forgotten Heroes (+10), The Arakkoa Threat (+250), The Finest Down (+250), Gaining Mirren's Trust (+250).
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.