- 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:
- In Chapter V:
Geralt starts the game with one earth rune. Later, they can be purchased from a number of merchants, including the mysterious merchant, Haggard or Thorak in Vergen, or Falas, the Incredible Lockhart or Polycarp of Rinde during Chapter III.
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.