Heart of Earth

The Heart of Earth is one of the five fragments of the great Blackrock Obelisk of Pagan. It is Lithos' object of power. It appears in  Ultima VIII.

Description
When the Obelisk was shattered by the Guardian, the Heart of Earth landed in Stone Cove, where Lithos found it and stored it safely in the Catacombs, specifically the Pit of Death part that housed the Chapel of the Dead. It was there, where the Avatar found it in an ancient grave, and later used it to drain Lithos of his powers, destroying him in the process. It melted into the other fragments, reforming the Obelisk.

Trivia

 * Originally, removing the Heart triggered the undead invasion of Tenebrae but the event is removed from the released game. See Plot Cuts in Ultima VIII.
 * The game can be broken by getting the heart even before meeting Lithos and then using it on him on the first meeting. Since he there appears in a cutscene, one has to drink a purple potion and attack one of the skeletons, so its starts to push the Avatar back towars where Lithos appears with its attacks. The Heart has to be double-clicked on to make the crosshair appear. One the Avatar is close, Lithos appears and can be absorbed, breaking the game.