Obsidian, a black, sharp rock. Very sharp. So sharp that it was used in the earliest times to make weapons, wage war, and start empires.

There's more to know, though. From counting and molecular structure, to who some of those early empires were. And what happened to them. At least, according to some. And we'll just bet after filling your head with this knowledge, you'll be able to make the edge kingdoms in your games much more interesting.

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