The Gems are a spacefaring alien race who discovered and surveyed Eamon around 5100 BA. They established a small outpost that operated for more than a century but abandoned it when they determined the planet to be unsuitable for colonization.
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The dark-themed display can be easier on the eyes.
Displayed as blue insets, author's notes appear throughout the text of the Guide and give insight into how and where certain features of the world of Eamon originated.