Where to Farm Pattern: Invulnerable Mail

The best place to farm Pattern: Invulnerable Mail is Naxxramas, where Necropolis Acolyte (level 62) drops it at 0.1%. That is the vanilla 1.12 chance, not yet confirmed in Forever. 30 sources are ranked below by drop chance.

Best zones:

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

Zone	Sources	Best source	Level	Drop% ▼
Blackrock Spire	6	Goraluk Anvilcrack	61+	14.3%
Unknown zone	2	Ragnaros	63+	2.6%
Azshara	1	Azuregos	63+	1.3%
Onyxia's Lair	2	Onyxia	63+	1.3%
Blasted Lands	1	Lord Kazzak	63+	0.3%
Naxxramas	3	Necropolis Acolyte	62+	0.1%
Zul'Gurub	2	Soulflayer	61+	0.0%
Molten Core	3	Firelord	61-62+	0.0%
Blackwing Lair	2	Blackwing Warlock	61+	0.0%
Scholomance	2	Risen Construct	58-61+	0.0%
Ahn'Qiraj	1	Vekniss Stinger	62+	0.0%
Wetlands	1	Axtroz	62+	0.0%
Duskwood	1	Emeriss	63+	0.0%
Feralas	1	Lethon	63+	0.0%
Ashenvale	1	Taerar	63+	0.0%

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All sources, by drop chance:

Vanilla reference — from the 1.12 world data, not yet confirmed in Forever.

Source	Level	Zone	Spawns	Side	How	Drop% ▼	Map
Goraluk Anvilcrack(elite)	61+	Blackrock Spire	1		Drop	14.3%	map
Ragnaros(elite)	63+		0		Drop	2.6%	map
Azuregos(elite)	63+	Azshara	1		Drop	1.3%	map
Onyxia(elite)	63+	Onyxia's Lair	1		Drop	1.3%	map
Lord Kazzak(elite)	63+	Blasted Lands	1		Drop	0.3%	map
Necropolis Acolyte(elite)	62+	Naxxramas	48		Drop	0.1%	map
Stoneskin Gargoyle(elite)	61+	Naxxramas	8		Drop	0.1%	map
Soulflayer(elite)	61+	Zul'Gurub	10		Drop	0.0%	map
Carrion Spinner(elite)	61+	Naxxramas	21		Drop	0.0%	map
Firelord(elite)	61-62+	Molten Core	18		Drop	0.0%	map
Lava Annihilator(elite)	61-62+	Molten Core	18		Drop	0.0%	map
Blackhand Elite(elite)	60-61+	Blackrock Spire	17		Drop	0.0%	map
Blackwing Warlock(elite)	61+	Blackwing Lair	14		Drop	0.0%	map
Molten Giant(elite)	62+	Molten Core	13		Drop	0.0%	map
Blackhand Assassin(elite)	60-61+	Blackrock Spire	12		Drop	0.0%	map
Risen Construct(elite)	58-61+	Scholomance	12		Drop	0.0%	map
Gurubashi Bat Rider(elite)	61+	Zul'Gurub	11		Drop	0.0%	map
Vekniss Stinger(elite)	62+	Ahn'Qiraj	9		Drop	0.0%	map
Blackwing Spellbinder(elite)	62+	Blackwing Lair	8		Drop	0.0%	map
Rage Talon Dragon Guard(elite)	60-61+	Blackrock Spire	8		Drop	0.0%	map
Rage Talon Fire Tongue(elite)	60-61+	Blackrock Spire	7		Drop	0.0%	map
Onyxian Warder(elite)	60-63+	Onyxia's Lair	5		Drop	0.0%	map
Rage Talon Captain(elite)	62+	Blackrock Spire	5		Drop	0.0%	map
Risen Warrior(elite)	59-61+	Scholomance	2		Drop	0.0%	map
Axtroz(elite)	62+	Wetlands	1		Drop	0.0%	map
Emeriss(elite)	63+	Duskwood	1		Drop	0.0%	map
Lethon(elite)	63+	Feralas	1		Drop	0.0%	map
Taerar(elite)	63+	Ashenvale	1		Drop	0.0%	map
Ysondre(elite)	63+	The Hinterlands	1		Drop	0.0%	map
Nefarian(elite)	63+		0		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 (vanilla reference — from the 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.