A heartstone (aadrian: tetliyolo) is an object, usually that of a small stone or gem, upon which a magical lattice is placed which grants otherwise inanimate objects, animation and/or intelligence.

They were invented and used by the ancient Shi'imti in order to create their warforged. When the empire fell, the information of how they worked and how they were constructed was lost.

It wasn't until the 3rd century of the Age of Knowledge that Tenser the Loremaster discovered not only the purpose and operation of these items, but also how to create them. He even created a sophisticated heartstone that powered his tower, Story Ancient.

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