Where to Farm Plans: Thorium Helm

The best place to farm Plans: Thorium Helm is Silithus, where Whirling Invader (level 57-58) drops it at 0.1%. That is the vanilla 1.12 chance, not yet confirmed in Forever. 517 sources are ranked below by drop chance.

Gold per kill: Whirling Invader is worth about 5s 46c a kill in item drops (prices from 10 Oct 2026). 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% ▼
Blasted Lands	11	Lord Kazzak	63+	0.7%
Burning Steppes	22	Solid Chest		0.5%
Blackrock Spire	52	Large Solid Chest		0.5%
Eastern Plaguelands	50	Solid Chest		0.5%
Western Plaguelands	34	Large Mithril Bound Chest		0.5%
Blackrock Depths	22	Dark Coffer		0.3%
Naxxramas	4	Plagued Ghoul	61+	0.2%
Zul'Gurub	27	Voodoo Slave	60+	0.1%
Silithus	33	Hive'Zora Reaver	59-60+	0.1%
Unknown zone	28	Lathoric the Black	52+	0.1%
Stratholme	32	Crimson Guardsman	57-58+	0.1%
Dire Maul	30	Eldreth Phantasm	58-59+	0.1%
Scholomance	22	Risen Construct	58-61+	0.1%
Stranglethorn Vale	2	Hakkari Oracle	55-56+	0.1%
Winterspring	39	Hederine Manastalker	59-60+	0.0%

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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
Lord Kazzak(elite)	63+	Blasted Lands	1		Drop	0.7%	map
Solid Chest		Burning Steppes	56		Contains	0.5%	map
Large Solid Chest		Blackrock Spire	37		Contains	0.5%	map
Large Mithril Bound Chest		Blackrock Spire	36		Contains	0.5%	map
Solid Chest		Eastern Plaguelands	30		Contains	0.5%	map
Large Mithril Bound Chest		Western Plaguelands	3		Contains	0.5%	map
Large Solid Chest		Western Plaguelands	3		Contains	0.5%	map
Dark Coffer		Blackrock Depths	1		Contains	0.3%	map
Plagued Ghoul(elite)	61+	Naxxramas	150		Drop	0.2%	map
Bloodaxe Summoner(elite)	57-58+	Blackrock Spire	9		Drop	0.1%	map
Voodoo Slave(elite)	60+	Zul'Gurub	9		Drop	0.1%	map
Firebrand Legionnaire(elite)	57-58+	Blackrock Spire	4		Drop	0.1%	map
Sandfury Speaker	61	Zul'Gurub	1		Drop	0.1%	map
Hive'Zora Reaver(elite)	59-60+	Silithus	29		Drop	0.1%	map
Blackhand Summoner(elite)	59-60+	Blackrock Spire	15		Drop	0.1%	map
Lathoric the Black(elite)	52+		0		Drop	0.1%	map
Withered Mistress(elite)	60+	Zul'Gurub	29		Drop	0.1%	map
Crimson Guardsman(elite)	57-58+	Stratholme	17		Drop	0.1%	map
Smolderthorn Berserker(elite)	57-58+	Blackrock Spire	13		Drop	0.1%	map
Crimson Initiate(elite)	57-58+	Stratholme	9		Drop	0.1%	map
Smolderthorn Shadow Hunter(elite)	56-57+	Blackrock Spire	6		Drop	0.1%	map
Summoned Blackhand Dreadweaver(elite)	59-60+		0		Drop	0.1%	map
Hive'Ashi Sandstalker(elite)	58-59+	Silithus	16		Drop	0.1%	map
Blackhand Veteran(elite)	59-60+	Blackrock Spire	35		Drop	0.1%	map
Gurubashi Blood Drinker(elite)	60+	Zul'Gurub	35		Drop	0.1%	map
Blackhand Dreadweaver(elite)	59-60+	Blackrock Spire	19		Drop	0.1%	map
Atal'ai Mistress(elite)	60+	Zul'Gurub	18		Drop	0.1%	map
Crimson Gallant(elite)	59-60+	Stratholme	18		Drop	0.1%	map
Blackhand Iron Guard(elite)	60-61+	Blackrock Spire	17		Drop	0.1%	map
Thuzadin Acolyte	59-60	Stratholme	15		Drop	0.1%	map
Blackhand Assassin(elite)	60-61+	Blackrock Spire	12		Drop	0.1%	map
Bloodaxe Warmonger(elite)	57-58+	Blackrock Spire	12		Drop	0.1%	map
Eldreth Phantasm(elite)	58-59+	Dire Maul	12		Drop	0.1%	map
Risen Construct(elite)	58-61+	Scholomance	12		Drop	0.1%	map
Firebrand Invoker(elite)	56-57+	Blackrock Spire	11		Drop	0.1%	map
Crimson Defender(elite)	58-59+	Stratholme	9		Drop	0.1%	map
Hakkari Oracle(elite)	55-56+	Stranglethorn Vale	9		Drop	0.1%	map
Bloodaxe Raider(elite)	57-58+	Blackrock Spire	8		Drop	0.1%	map
Wildspawn Shadowstalker(elite)	56+	Dire Maul	8		Drop	0.1%	map
Crimson Battle Mage(elite)	59-60+	Stratholme	7		Drop	0.1%	map
Crypt Crawler(elite)	58-59+	Stratholme	7		Drop	0.1%	map
Hakkari Witch Doctor(elite)	60+	Zul'Gurub	7		Drop	0.1%	map
Spire Spider(elite)	57-58+	Blackrock Spire	7		Drop	0.1%	map
Crypt Beast(elite)	59-60+	Stratholme	6		Drop	0.1%	map
Arcane Torrent(elite)	59-60+	Dire Maul	5		Drop	0.1%	map
Scholomance Handler(elite)	59-60+	Scholomance	5		Drop	0.1%	map
Splintered Skeleton(elite)	59-60+	Scholomance	5		Drop	0.1%	map
Wildspawn Rogue(elite)	56-57+	Dire Maul	5		Drop	0.1%	map
Firebrand Pyromancer(elite)	57-58+	Blackrock Spire	4		Drop	0.1%	map
Necrofiend(elite)	58-60+	Scholomance	4		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.