Where to Farm Thorium Lockbox

The best place to farm Thorium Lockbox is Eastern Plaguelands, where Plague Monstrosity (level 57-58) drops it at 0.5%. That is the vanilla 1.12 chance, not yet confirmed in Forever. 456 sources are ranked below by drop chance.

Gold per kill: Plague Monstrosity is worth about 11s 56c a kill in item drops (at Auction House prices). Gold farming spots, level 50-60

Best zones:

The 15 zones with the best source; every source is listed below.

Zone	Sources	Best source	Level	Drop% ▼
Ashenvale	1	Emeraldon Tree Warder	60+	5.5%
Western Plaguelands	32	Scarlet Executioner	60+	4.2%
Unknown zone	48	Seasoned Reaver	59+	3.7%
Eastern Plaguelands	51	Blighthound	58-59+	2.9%
Silithus	43	Hive'Zora Tunneler	58-59+	1.8%
Burning Steppes	17	Malfunctioning Reaver	56	1.7%
Hillsbrad Foothills	3	Writhing Mage	58-59+	1.5%
Blasted Lands	10	Manahound	60+	1.5%
The Hinterlands	1	Verdantine Tree Warder	60+	1.4%
Felwood	8	Lord Banehollow	59+	1.4%
Dire Maul	38	Eldreth Phantasm	58-59+	1.3%
Blackrock Spire	41	Blackhand Thug	60+	1.1%
Zul'Gurub	19	Zulian Cub	60	1.1%
Blackrock Depths	8	Shill Dinger	56+	1.1%
Winterspring	47	Hederine Manastalker	59-60+	1.0%

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All sources, by drop chance:

Classic data: from the patch 1.12 world data, not yet confirmed in Forever.

Source	Level	Zone	Spawns	Side	How	Drop% ▼	Map
Firebrand Darkweaver(elite)	56-57+	Blackrock Spire	13		Drop	0.4%	map
Whirling Invader	57-58	Silithus	3		Drop	0.3%	map
Thuzadin Shadowcaster(elite)	58-59+	Stratholme	14		Drop	0.3%	map
Eldreth Seether(elite)	58-59+	Dire Maul	14		Drop	0.3%	map
Scholomance Dark Summoner(elite)	58-59+	Scholomance	6		Drop	0.3%	map
Wildspawn Felsworn(elite)	55-56+	Dire Maul	6		Drop	0.3%	map
Atal'ai Mistress(elite)	60+	Zul'Gurub	18		Drop	0.3%	map
Spectral Researcher(elite)	58-60+	Scholomance	7		Drop	0.3%	map
Patchwork Horror(elite)	57-58+	Stratholme	3		Drop	0.3%	map
Gurubashi Blood Drinker(elite)	60+	Zul'Gurub	35		Drop	0.3%	map
Spire Scorpid	58	Blackrock Spire	30		Drop	0.3%	map
Hakkari Priest(elite)	60+	Zul'Gurub	34		Drop	0.3%	map
Ironhide Devilsaur(elite)	54-56+	Un'Goro Crater	6		Drop	0.3%	map
Chromatic Whelp	57-58		0		Drop	0.3%	map
Ulathek	57	Felwood	1		Drop	0.3%	map
Blackhand Incarcerator	59-60	Blackrock Spire	7		Drop	0.3%	map
Bile Spewer(elite)	59-60+	Stratholme	4		Drop	0.3%	map
Spellmaw(elite)	56+	Winterspring	1		Drop	0.3%	map
Crypt Beast(elite)	59-60+	Stratholme	6		Drop	0.3%	map
Diseased Ghoul(elite)	58-59+	Scholomance	34		Drop	0.3%	map
Smolderthorn Shadow Hunter(elite)	56-57+	Blackrock Spire	6		Drop	0.3%	map
Wildspawn Satyr(elite)	55-56+	Dire Maul	13		Drop	0.3%	map
Petrified Treant(elite)	57-59+	Dire Maul	15		Drop	0.3%	map
Blackhand Assassin(elite)	60-61+	Blackrock Spire	12		Drop	0.3%	map
Wrath Hammer Construct(elite)	55-56+	Blackrock Depths	3		Drop	0.3%	map
Gordok Mastiff	57-59	Dire Maul	68		Drop	0.3%	map
Servant of Razelikh	57	Blasted Lands	7		Drop	0.3%	map
Scalebane Lieutenant(elite)	60-61+	Wetlands	7		Drop	0.3%	map
Frostmaul Giant(elite)	59-60+	Winterspring	27		Drop	0.3%	map
Ironbark Protector(elite)	57-59+	Dire Maul	8		Drop	0.3%	map
Rage Talon Dragon Guard(elite)	60-61+	Blackrock Spire	8		Drop	0.3%	map
Arcane Chimaerok(elite)	60-62+	Feralas	9		Drop	0.3%	map
Risen Construct(elite)	58-61+	Scholomance	12		Drop	0.3%	map
Cyclone Warrior	57-59	Silithus	5		Drop	0.3%	map
Greater Silithid Flayer(elite)	54-57+	Tanaris	72		Drop	0.3%	map
Frostmaul Preserver(elite)	59-60+	Winterspring	27		Drop	0.3%	map
Residual Monstrosity(elite)	59-60+	Dire Maul	18		Drop	0.3%	map
Carrion Swarmer	57-58	Dire Maul	60		Drop	0.3%	map
Ziggurat Protector(elite)	58+	Eastern Plaguelands	6		Drop	0.3%	map
Hive'Ashi Ambusher	56-57		0		Drop	0.3%	map
Avalanchion(elite)	58+	Azshara	1		Drop	0.3%	map
Terrordale Spirit	59-60		0		Drop	0.3%	map
Hederine Initiate(elite)	59-60+	Winterspring	17		Drop	0.3%	map
Eldreth Spirit(elite)	57-58+	Dire Maul	17		Drop	0.3%	map
Spectral Citizen(elite)	55-56+	Stratholme	14		Drop	0.3%	map
Hive'Regal Hive Lord(elite)	59-61+	Silithus	34		Drop	0.3%	map
Flamescale Wyrmkin(elite)	57-58+	Burning Steppes	27		Drop	0.2%	map
Watery Invader	56-58	Winterspring	4		Drop	0.2%	map
Gorishi Hive Queen	56		0		Drop	0.2%	map
Rak'shiri(rare)	57	Winterspring	1		Drop	0.2%	map
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Drop% is the rate recorded in Forever once a source has been looted ten times; a greyed figure is the vanilla 1.12 chance from the world data (classic data: from the patch 1.12 world data, not yet confirmed in forever). Spawns counts the source's spawn points in the world data. "Side" names which side can kill the NPC when the other finds it friendly. The lead picks the best chance among sources that are not a rare spawn and have at least three spawn points.