Where to Farm Thick Spider's Silk

The best place to farm Thick Spider's Silk is Eastern Plaguelands, where Crypt Horror (level 57-58) drops it at 26.5%. That is the vanilla 1.12 chance, not yet confirmed in Forever. 45 sources are ranked below by drop chance.

Best zones:

Zone	Sources	Best source	Level	Drop%
Eastern Plaguelands	4	Crypt Horror	57-58	26.5%
Western Plaguelands	3	Plague Lurker	54-55	25.8%
Silithus	3	Sand Skitterer	55-56	23.6%
Azshara	1	Timberweb Recluse	47-48	23.3%
Searing Gorge	4	Searing Lava Spider	45-47	23.2%
The Hinterlands	1	Witherbark Broodguard	44-45	20.9%
Swamp of Sorrows	2	Deathstrike Tarantula	40-41	20.1%
Scholomance	1	Necrofiend	58-60+	20.1%
Stratholme	3	Crypt Crawler	58-59+	18.8%
Blackrock Spire	4	Spire Spiderling	55-56	17.7%
Unknown zone	7	Cave Creeper	50-52	17.6%
Arathi Highlands	2	Plains Creeper	32-33	10.6%
Dustwallow Marsh	9	Giant Darkfang Spider	40-41	10.2%
The Barrens	1	Darkmist Widow	40	6.2%

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
Crypt Horror	57-58	Eastern Plaguelands	13		Drop	26.5%	map
Plague Lurker	54-55	Western Plaguelands	75		Drop	25.8%	map
Crypt Slayer	58-59	Eastern Plaguelands	36		Drop	25.1%	map
Crypt Fiend	53-54	Eastern Plaguelands	12		Drop	25.0%	map
Crypt Walker	55-56	Eastern Plaguelands	14		Drop	24.9%	map
Carrion Lurker	52-53	Western Plaguelands	63		Drop	24.1%	map
Venom Mist Lurker	50-51	Western Plaguelands	49		Drop	24.0%	map
Sand Skitterer	55-56	Silithus	156		Drop	23.6%	map
Gretheer(rare)	57	Silithus	1		Drop	23.4%	map
Timberweb Recluse	47-48	Azshara	24		Drop	23.3%	map
Searing Lava Spider	45-47	Searing Gorge	26		Drop	23.2%	map
Greater Lava Spider	47-49	Searing Gorge	26		Drop	23.1%	map
Rock Stalker	57-58	Silithus	163		Drop	23.1%	map
Glassweb Spider	43-45	Searing Gorge	20		Drop	22.4%	map
Witherbark Broodguard	44-45	The Hinterlands	20		Drop	20.9%	map
Rekk'tilac(rare)	48	Searing Gorge	1		Drop	20.7%	map
Deathstrike Tarantula	40-41	Swamp of Sorrows	38		Drop	20.1%	map
Necrofiend(elite)	58-60+	Scholomance	4		Drop	20.1%	map
Crypt Crawler(elite)	58-59+	Stratholme	7		Drop	18.8%	map
Crypt Beast(elite)	59-60+	Stratholme	6		Drop	18.5%	map
Spire Spiderling	55-56	Blackrock Spire	12		Drop	17.7%	map
Cave Creeper	50-52		0		Drop	17.6%	map
Sorrow Spinner	36-37	Swamp of Sorrows	27		Drop	17.0%	map
Spire Spider(elite)	57-58+	Blackrock Spire	7		Drop	15.6%	map
Tomb Reaver(elite)	37+		0		Drop	15.3%	map
Shadra(elite)	55+		0		Drop	14.0%	map
Tomb Fiend	35		0		Drop	13.4%	map
Plains Creeper	32-33	Arathi Highlands	113		Drop	10.6%	map
Giant Darkfang Spider	40-41	Dustwallow Marsh	28		Drop	10.2%	map
Darkfang Creeper	38-39	Dustwallow Marsh	45		Drop	9.3%	map
Darkfang Venomspitter	37-38	Dustwallow Marsh	82		Drop	9.3%	map
Darkfang Lurker	36-37	Dustwallow Marsh	58		Drop	9.0%	map
Darkmist Lurker	37-38	Dustwallow Marsh	7		Drop	8.3%	map
Darkfang Spider	35-36	Dustwallow Marsh	37		Drop	7.8%	map
Darkmist Recluse	36-37	Dustwallow Marsh	19		Drop	7.6%	map
Darkmist Silkspinner	38-39	Dustwallow Marsh	24		Drop	7.5%	map
Darkmist Spider	35-36	Dustwallow Marsh	20		Drop	6.7%	map
Giant Plains Creeper	35-36	Arathi Highlands	43		Drop	6.2%	map
Darkmist Widow(rare)	40	The Barrens	1		Drop	6.2%	map
Mother Smolderweb(elite)	59+	Blackrock Spire	1		Drop	6.0%	map
Nerub'enkan(elite)	60+	Stratholme	1		Drop	6.0%	map
Hedrum the Creeper(elite)	53+		0		Drop	6.0%	map
Crystal Fang(rare)	60+	Blackrock Spire	1		Drop	5.0%	map
Anub'shiah(elite)	54+		0		Drop	5.0%	map
Tuten'kash(elite)	40+		0		Drop	5.0%	map

Needed for:

Recipes:

Recipe	Profession	Needs
Boots of the Enchanter	Tailoring	2x
Boots of the Enchanter	Tailoring	2x
Enchanter's Cowl	Tailoring	2x
Enchanter's Cowl	Tailoring	2x
Gnomish Net-o-Matic Projector	Engineering	4x
Icy Cloak	Tailoring	2x
Spider Belt	Tailoring	2x
Swift Boots	Leatherworking	2x

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.