Where to Farm Plans: Heavy Mithril Helm

The best place to farm Plans: Heavy Mithril Helm is Tanaris, where Centipaar Swarmer (level 49-50) drops it at 0.0%. That is the vanilla 1.12 chance, not yet confirmed in Forever. 531 sources are ranked below by drop chance.

Gold per kill: Centipaar Swarmer is worth about 6s 13c a kill in item drops (prices from 10 Oct 2026). Gold farming spots, level 40-50

Best zones:

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

Zone	Sources	Best source	Level	Drop% ▼
The Hinterlands	35	Grimungous	50+	2.0%
Stranglethorn Vale	21	Arena Treasure Chest		1.5%
Burning Steppes	16	Solid Chest		0.5%
Blackrock Spire	17	Large Solid Chest		0.5%
Feralas	50	Shore Strider	48-49+	0.4%
Unknown zone	29	Zapped Cliff Giant	49-50	0.3%
Tanaris	39	Omgorn the Lost	50	0.3%
The Temple of Atal'Hakkar	17	Atal'ai Corpse Eater	49-50+	0.1%
Maraudon	21	Celebrian Dryad	45-46+	0.1%
Blackrock Depths	29	Hammered Patron	48-52+	0.1%
Searing Gorge	23	Twilight Idolater	49-51+	0.1%
Uldaman	11	Stone Keeper	46+	0.0%
Zul'Farrak	14	Sandfury Shadowhunter	45-46+	0.0%
Azshara	36	Timberweb Recluse	47-48	0.0%
Swamp of Sorrows	10	Mummified Atal'ai	46-47+	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
Grimungous(rare)	50+	The Hinterlands	1		Drop	2.0%	map
Arena Treasure Chest		Stranglethorn Vale	1		Contains	1.5%	map
Solid Chest		Stranglethorn Vale	104		Contains	0.5%	map
Solid Chest		Burning Steppes	56		Contains	0.5%	map
Solid Chest		The Hinterlands	52		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
Shore Strider(elite)	48-49+	Feralas	20		Drop	0.4%	map
Zapped Cliff Giant	49-50		0		Drop	0.3%	map
Omgorn the Lost(rare)	50	Tanaris	1		Drop	0.3%	map
Mok'rash(elite)	50+	Stranglethorn Vale	1		Drop	0.2%	map
Dark Keeper Uggel(elite)	55+		0		Drop	0.2%	map
Arash-ethis(rare)	49	Feralas	1		Drop	0.2%	map
Mai'Zoth(elite)	47+	Stranglethorn Vale	1		Drop	0.2%	map
Myzrael(elite)	44+		0		Drop	0.2%	map
Treasure Hunting Pirate	44-45		0		Drop	0.1%	map
Atal'ai Corpse Eater(elite)	49-50+	The Temple of Atal'Hakkar	7		Drop	0.1%	map
Celebrian Dryad(elite)	45-46+	Maraudon	6		Drop	0.1%	map
Dark Guard(elite)	53-54+		0		Drop	0.1%	map
Noxxious Scion	45-46		0		Drop	0.1%	map
Deep Stinger	50-52		0		Drop	0.1%	map
Subterranean Diemetradon(elite)	46-48+	Maraudon	31		Drop	0.1%	map
Murk Worm(elite)	47-48+	The Temple of Atal'Hakkar	22		Drop	0.1%	map
Hammered Patron(elite)	48-52+	Blackrock Depths	12		Drop	0.1%	map
Sister of Celebrian(elite)	46-47+	Maraudon	12		Drop	0.1%	map
Unliving Atal'ai(elite)	48-49+	The Temple of Atal'Hakkar	9		Drop	0.1%	map
Twilight Idolater(elite)	49-51+	Searing Gorge	4		Drop	0.1%	map
Mogh the Undying(elite)	44+	Stranglethorn Vale	1		Drop	0.1%	map
Hematus(elite)	50+		0		Drop	0.1%	map
Spirestone Mystic(elite)	55-56+	Blackrock Spire	3		Drop	0.1%	map
Treasure Hunting Buccaneer	44-45		0		Drop	0.1%	map
Veng(elite)	47+		0		Drop	0.1%	map
Stone Keeper(elite)	46+	Uldaman	4		Drop	0.0%	map
Deep Borer	46-48	Maraudon	98		Drop	0.0%	map
Centipaar Swarmer	49-50	Tanaris	84		Drop	0.0%	map
Constrictor Vine(elite)	45-46+	Maraudon	57		Drop	0.0%	map
Anvilrage Soldier(elite)	52-53+	Blackrock Depths	38		Drop	0.0%	map
Gordok Mauler(elite)	53-54+	Feralas	37		Drop	0.0%	map
Sandfury Shadowhunter(elite)	45-46+	Zul'Farrak	35		Drop	0.0%	map
Atal'ai Witch Doctor(elite)	49-50+	The Temple of Atal'Hakkar	28		Drop	0.0%	map
Guzzling Patron	48-52	Blackrock Depths	28		Drop	0.0%	map
Vilebranch Blood Drinker(elite)	49-50+	The Hinterlands	28		Drop	0.0%	map
Noxious Slime(elite)	46-47+	Maraudon	27		Drop	0.0%	map
Scarshield Spellbinder(elite)	54-55+	Blackrock Spire	26		Drop	0.0%	map
Timberweb Recluse	47-48	Azshara	24		Drop	0.0%	map
Twilight's Hammer Torturer(elite)	50-51+	Blackrock Depths	24		Drop	0.0%	map
Mummified Atal'ai(elite)	46-47+	Swamp of Sorrows	23		Drop	0.0%	map
Twilight Fire Guard(elite)	48-49+	Searing Gorge	23		Drop	0.0%	map
Anvilrage Officer(elite)	53-54+	Blackrock Depths	20		Drop	0.0%	map
Gurubashi Warrior(elite)	54-55+	Stranglethorn Vale	19		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.