Where to Farm Core of Earth

The best place to farm Core of Earth is Silithus, where Desert Rumbler (level 56-58) drops it at 5.0%. That is the vanilla 1.12 chance, not yet confirmed in Forever. 36 sources are ranked below by drop chance.

Gold per kill: Desert Rumbler is worth about 30s 30c a kill in item drops (at Auction House prices). Gold farming spots, level 50-60

Best zones:

Zone	Sources	Best source	Level	Drop% ▼
Azshara	2	Avalanchion	58+	66.0%
Unknown zone	7	Baron Kazum	63+	9.0%
Molten Core	8	Garr	63+	6.0%
Silithus	2	Desert Rumbler	56-58	5.0%
Felwood	2	Infernal Sentry	52-53+	5.0%
Burning Steppes	3	Greater Obsidian Elemental	55-57	5.0%
Maraudon	2	Theradrim Guardian	47-48+	4.0%
Searing Gorge	1	Smoldar	50	4.0%
Tanaris	2	Land Rager	45-47	3.0%
Desolace	4	Ambershard Destroyer	42-43+	1.6%
Badlands	3	Rumbler	45	1.5%

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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
Avalanchion(elite)	58+	Azshara	1		Drop	66.0%	map
Baron Kazum(elite)	63+		0		Drop	9.0%	map
The Duke of Shards(elite)	62+		0		Drop	9.0%	map
Golemagg the Incinerator(elite)	63+	Molten Core	1		Drop	6.0%	map
Garr(elite)	63+	Molten Core	1		Drop	6.0%	map
Desert Rumbler	56-58	Silithus	28		Drop	5.0%	map
Thundering Invader	55-57	Azshara	3		Drop	5.0%	map
Obsidian Elemental	51-53	Burning Steppes	7		Drop	5.0%	map
Greater Obsidian Elemental	55-57	Burning Steppes	8		Drop	5.0%	map
Infernal Bodyguard(elite)	53-54+		0		Drop	5.0%	map
Infernal Sentry(elite)	52-53+	Felwood	4		Drop	5.0%	map
Desert Rager	58-59	Silithus	3		Drop	4.0%	map
Theradrim Guardian(elite)	47-48+	Maraudon	8		Drop	4.0%	map
Earthen Templar(elite)	60+		0		Drop	4.0%	map
Fam'retor Guardian	45		0		Drop	4.0%	map
Immolatus(rare)	56+	Felwood	1		Drop	4.0%	map
Smoldar(rare)	50	Searing Gorge	1		Drop	4.0%	map
Theradrim Shardling	46	Maraudon	24		Drop	3.0%	map
Land Rager	45-47	Tanaris	5		Drop	3.0%	map
Ground Pounder	41-43	Tanaris	4		Drop	3.0%	map
Volchan(rare)	60+	Burning Steppes	1		Drop	2.0%	map
Myzrael(elite)	44+		0		Drop	2.0%	map
Lava Surger(elite)	61-62+	Molten Core	12		Drop	1.7%	map
Ambershard Destroyer(elite)	42-43+	Desolace	2		Drop	1.6%	map
Rumbler(rare)	45	Badlands	1		Drop	1.5%	map
Lokholar the Ice Lord(elite)	61+		0	Alliance only	Drop	1.4%	map
Lava Annihilator(elite)	61-62+	Molten Core	18		Drop	1.3%	map
Ambershard Crusher(elite)	40-41+	Desolace	2		Drop	1.1%	map
Enraged Rock Elemental	42-43	Badlands	12		Drop	1.0%	map
Molten Giant(elite)	62+	Molten Core	13		Drop	0.9%	map
Lava Elemental(elite)	61-62+	Molten Core	14		Drop	0.9%	map
Lava Reaver(elite)	62-63+	Molten Core	6		Drop	0.9%	map
Greater Rock Elemental	42-44	Badlands	28		Drop	0.9%	map
Shadowshard Rumbler(elite)	40-41+	Desolace	8		Drop	0.6%	map
Shadowshard Smasher(elite)	41-42+	Desolace	7		Drop	0.6%	map
Molten Destroyer(elite)	63+	Molten Core	9		Drop	0.4%	map

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Needed for:

Quests:

Level ▲	Quest	Needs
55	Elemental Leatherworking	2x
55	Elemental Leatherworking	2x

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Recipes:

Recipe ▲	Profession	Needs
Dimensional Transporter - Mt. Hyjal	Engineering	4x
Enchant Cloak - Greater Resistance	Enchanting	1x
Gauntlets of the Sea	Leatherworking	2x
Helm of Fire	Leatherworking	4x
Lil' Smoky	Engineering	1x
Masterwork Volcanic Leggings	Leatherworking	1x
Runed Mithril Hammer	Blacksmithing	2x
Shining Mithril Helm	Blacksmithing	1x
Shining Mithril Pants	Blacksmithing	1x
The Shatterer	Blacksmithing	4x
Ultrasafe Transporter - Gadgetzan	Engineering	4x
Volcanic Leggings	Leatherworking	1x

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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.