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
Twilight Marauder	58-59	Silithus	5		Drop	0.1%	map
Twilight Geolord	59-60	Silithus	95		Drop	0.1%	map
Surgical Assistant(elite)	60+	Naxxramas	20		Drop	0.1%	map
Ranger Lord Hawkspear(rare)	60	Eastern Plaguelands	1	Horde only	Drop	0.1%	map
Scarlet Worker	55-57	Western Plaguelands	56		Drop	0.1%	map
Plaguehound	55-56	Eastern Plaguelands	94		Drop	0.1%	map
Skeletal Guardian	55-56	Stratholme	67		Drop	0.1%	map
Hate Shrieker	55-57	Eastern Plaguelands	31		Drop	0.1%	map
Stitched Horror	57-58	Eastern Plaguelands	45		Drop	0.1%	map
Bloodaxe Worg	56-57	Blackrock Spire	16		Drop	0.1%	map
Arcane Feedback	59-60	Dire Maul	15		Drop	0.1%	map
Diseased Grizzly	55-56	Western Plaguelands	75		Drop	0.1%	map
Ice Thistle Yeti	55-56	Winterspring	40		Drop	0.1%	map
Twilight Overlord	60-61	Silithus	24		Drop	0.1%	map
Stormpike Ranger(elite)	56+		0	Horde only	Drop	0.1%	map
Earthen Templar(elite)	60+		0		Drop	0.1%	map
Frostsaber Cub	55-56	Winterspring	22		Drop	0.1%	map
Twilight Marauder Morna(elite)	60+	Silithus	1		Drop	0.1%	map
Anguished Highborne	55-56	Winterspring	42		Drop	0.1%	map
Spectral Attendant	60	Western Plaguelands	3		Drop	0.1%	map
Putrid Gargoyle	54-56	Eastern Plaguelands	30		Drop	0.1%	map
Rotting Behemoth	55-56	Western Plaguelands	39		Drop	0.1%	map
Greater Obsidian Elemental	55-57	Burning Steppes	8		Drop	0.1%	map
Spire Spiderling	55-56	Blackrock Spire	12		Drop	0.1%	map
Cavalier Durgen	57	Western Plaguelands	1		Drop	0.1%	map
Twilight Flamereaver	60	Silithus	13		Drop	0.1%	map
Eye of Naxxramas	55-57	Stratholme	3		Drop	0.1%	map
Spell Eater	54-56	Winterspring	11		Drop	0.1%	map
Tortured Druid	55-56	Silithus	23		Drop	0.1%	map
Crypt Slayer	58-59	Eastern Plaguelands	36		Drop	0.1%	map
Searing Ghoul	55-56	Western Plaguelands	86		Drop	0.1%	map
Winterspring Owl	54-56	Winterspring	44		Drop	0.1%	map
Weapon Technician	54-56	Blackrock Depths	21		Drop	0.1%	map
Winterfall Den Watcher	55-56	Winterspring	33		Drop	0.1%	map
Condemned Monk(elite)	58-59+	Hillsbrad Foothills	4		Drop	0.1%	map
Raging Owlbeast	54-56	Winterspring	22		Drop	0.0%	map
Skeletal Highborne	57-58	Dire Maul	24		Drop	0.0%	map
Twilight Master	60	Silithus	9		Drop	0.0%	map
Berserk Owlbeast	58-59	Winterspring	79		Drop	0.0%	map
Frostwolf Outrunner(elite)	56+		0	Alliance only	Drop	0.0%	map
Blazing Invader	54-56	Un'Goro Crater	3		Drop	0.0%	map
Fetid Zombie	54-56	Western Plaguelands	3		Drop	0.0%	map
Devouring Ooze	55-56	Western Plaguelands	26		Drop	0.0%	map
Deadwind Brute	55-56	Deadwind Pass	9		Drop	0.0%	map
Woodsman	58-59	Eastern Plaguelands	9	Horde only	Drop	0.0%	map
Living Decay	55-56	Eastern Plaguelands	22		Drop	0.0%	map
Skeletal Acolyte	55-56	Western Plaguelands	97		Drop	0.0%	map
Blackrock Sorcerer	55-56	Burning Steppes	11		Drop	0.0%	map
Scourge Warder	55-56	Eastern Plaguelands	8		Drop	0.0%	map
Unseen Servant	55-56	Eastern Plaguelands	2		Drop	0.0%	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.