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 Avenger	58-59	Silithus	119		Drop	0.1%	map
Scarlet Spellbinder	57-58	Western Plaguelands	9		Drop	0.1%	map
Dark Caster	56-57	Eastern Plaguelands	8		Drop	0.1%	map
Diseased Flayer	58-59	Eastern Plaguelands	62		Drop	0.1%	map
Noxious Plaguebat	54-56	Eastern Plaguelands	94		Drop	0.1%	map
Decaying Horror	56-57	Western Plaguelands	26		Drop	0.1%	map
Wildspawn Imp	56	Dire Maul	23		Drop	0.1%	map
Pathstrider	57-58	Eastern Plaguelands	5	Horde only	Drop	0.1%	map
Desert Rumbler	56-58	Silithus	28		Drop	0.1%	map
Rakaiah	56	Felwood	1		Drop	0.1%	map
Blackrock Battlemaster	57-58	Burning Steppes	8		Drop	0.1%	map
High Protector Tarsen	59	Western Plaguelands	1		Drop	0.1%	map
Venom Belcher(elite)	60-61+	Stratholme	9		Drop	0.1%	map
Stonelash Pincer	56	Silithus	111		Drop	0.1%	map
Risen Guardian	59-61		0		Drop	0.1%	map
Onyxian Warder(elite)	60-63+	Onyxia's Lair	5		Drop	0.1%	map
Flamescale Broodling	55-56	Burning Steppes	9		Drop	0.1%	map
Condemned Cleric(elite)	59-60+	Hillsbrad Foothills	4		Drop	0.1%	map
Shadowforge Senator	55-56	Blackrock Depths	34		Drop	0.1%	map
Winterspring Screecher	57-59	Winterspring	37		Drop	0.1%	map
Ice Thistle Matriarch	56-57	Winterspring	26		Drop	0.1%	map
Scourge Guard	57-58	Eastern Plaguelands	14		Drop	0.1%	map
Hungering Wraith	56-58	Western Plaguelands	62		Drop	0.1%	map
Scarlet Avenger	56-57	Western Plaguelands	6		Drop	0.1%	map
Plague Ravager	55-56	Eastern Plaguelands	20		Drop	0.1%	map
Deadwind Ogre Mage	55-57	Deadwind Pass	8		Drop	0.1%	map
Scourge Champion	59-60	Eastern Plaguelands	55		Drop	0.1%	map
Rock Stalker	57-58	Silithus	163		Drop	0.1%	map
Stone Guardian(elite)	60-61+	Un'Goro Crater	7		Drop	0.1%	map
Blackrock Slayer	56-57	Burning Steppes	20		Drop	0.1%	map
Spirestone Reaver(elite)	55-56+	Blackrock Spire	3		Drop	0.1%	map
Crypt Walker	55-56	Eastern Plaguelands	14		Drop	0.1%	map
Blighted Horror	56-57	Eastern Plaguelands	10		Drop	0.1%	map
Dread Weaver	58-59	Eastern Plaguelands	30		Drop	0.1%	map
Blackrock Soldier	55-56	Burning Steppes	11		Drop	0.1%	map
Unstable Corpse	58-59	Scholomance	21		Drop	0.1%	map
Dark Adept	58-59	Eastern Plaguelands	32		Drop	0.1%	map
Sand Skitterer	55-56	Silithus	156		Drop	0.1%	map
Risen Aberration	57-58	Scholomance	52		Drop	0.1%	map
Blackrock Warlock	56-57	Burning Steppes	17		Drop	0.1%	map
Moontouched Owlbeast	57-58	Winterspring	79		Drop	0.1%	map
Discordant Surge	54-57		0		Drop	0.1%	map
Freezing Ghoul	55-56	Western Plaguelands	26		Drop	0.1%	map
Shadowforge Citizen	54-56	Blackrock Depths	16		Drop	0.1%	map
Chieftain Bloodmaw	56	Felwood	1		Drop	0.1%	map
Dredge Striker	55-56	Silithus	67		Drop	0.1%	map
Mossflayer Scout	57-58	Eastern Plaguelands	12		Drop	0.1%	map
Shardtooth Mauler	55-56	Winterspring	55		Drop	0.1%	map
Wailing Death	56-57	Western Plaguelands	62		Drop	0.1%	map
Reanimated Corpse	58-59	Scholomance	31		Drop	0.1%	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.