Septium (七耀石, sepuchiumu) is a grouping of seven types of gemstones, found and actively mined across Zemuria. Septium have been viewed as symbols of mystery since ancient times. Their value as a source increased drastically when the technology to refine fragments of septium, also known as sepith (七耀石の欠片, sepisu), into quartz was developed. Larger chunks of septium are refined into jewels.
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