Eternal Earth

Eternal Earth is a material used in crafting recipes.

Source
It is not acquired directly, it is created by combining 10 Crystallized Earth.

Alchemy

 * Transmute: Eternal Earth to Shadow
 * Transmute: Eternal Earth to Air
 * Transmute: Eternal Might

Blacksmithing

 * Daunting Handguards
 * Daunting Legplates
 * Eternal Belt Buckle
 * Ornate Saronite Hauberk
 * Protectors of Life
 * Puresteel Legplates
 * Savage Saronite Hauberk
 * Socket Bracer

Enchanting

 * Greater Dodge (chest enchant)
 * Armsman

Engineering

 * Armored Titanium Goggles

Jewelcrafting

 * Blood Sun Necklace
 * Earthshadow Ring
 * Jade Dagger Pendant
 * Jade Ring of Slaying
 * Ring of Earthen Might
 * Shadowmight Ring
 * Stoneguard Band
 * Titanium Earthguard Chain
 * Titanium Earthguard Ring

Leatherworking

 * Jormungar Leg Armor
 * Jormungar Leg Chitin

Mining

 * Titansteel Bar