Sparks are a fictional alloy that exist in the Sparkverse. During the Rain of Sparks, over an estimated 25 billion sparks fell to the Earth's surface. They are solid and coin-like, measuring approximately 25 mm in diamter and 2 mm in thickness. They have a golden color and are highly reflective.
By a special exposure to sparks, humans and the range of lucian species can become sparkborn, enabling them to absorb and be healed by sparks. In the years the followed the Rain of the Sparks, several humans unwittingly became sparkborn. These occurrences became far less frequent after the sparks were gathered by Rubix Corp. and other organizations, and nearly all sparkborn created in recent years are the result of the war effort.