A heartstone is a fictional artifact common in dragon-related stories of high fantasy. It is a crystal of concentrated magic, and can be extracted from the heart of a slain dragon. It is believed that the heartstone is the source of a dragon's magic power, but this has never been proven definitively. Heartstones were considered a precious commodity in the Middle Ages, and were coveted for their wizard killing abilities. Generally the magnitude of a heartstone is directly related to the size of the dragon itself, though this is not always the case.
Concerning color and density, a heartstone will vary from dragon to dragon, the most common color is a shade between black and red, but heartstone colors ranging from yellow to violet have been recorded.
It is believed that a heartstone containing enough magic can be used in the manufacture of a Philosopher's Stone. However, this is only a theoretical conjecture.
In Skeleton Warriors A heartstone is a crystal that appear in the ribcage of a skeleton warrior after his transformation. If removed the skeleton returns to being a human, or whatever creature it was before the transformation. This vulnerability was a key point of the series.
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