Earth rune

Geralt starts the game with one earth rune. Later, they can be purchased from the following merchants:


 * the mysterious merchant
 * Haggard in Vergen
 * Thorak in Vergen
 * Falas in Loc Muinne
 * the Incredible Lockhart in Loc Muinne
 * Polycarp of Rinde in the Camp of the Order of the Flaming Rose

To use a rune, Geralt simply drags it over to one of the rune slots on a suitable sword in the inventory panel.

Earth runes can also be used to craft blue meteorite ore, though given that the price of an earth rune is eight times that of a piece of ore, it seems a poor use of the rune.

Locations

 * In Chapter II, received from Zoltan as reward for Memory of a Blade.
 * In Chapter III, received from Andrew Gablodda as one of three possible rewards.
 * In Chapter IV:
 * found on the corpse west of the ruined bridge outside Murky Waters.
 * received as one of three possible rewards for Old Habits Die Hard.
 * sold by the Blacksmith's son
 * In Chapter V:
 * Sold by the fence.
 * found on the corpse near the campfire in the Old manor swamp area.
 * found inside the Old Manor, in the room where Geralt fights two greater brothers. Re-enter the catacombs after the fight with Javed. In the trunk against the far wall.

Rune der Erde Γήινους ρούνους Rune de terre Runa della terra Runa ziemi