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Steven Universe, on a mission with the Crystal Gems, finds a large black gemstone with wave like patterns in the colors of fire. He shows it to the gems, who've surprisingly never seen such a gem before, and with a bit of convincing, allow him to take it home. When Steven awoke to get a midnight snack, the gem reformed and appeared in his kitchen. Who was this? Why havn't the gem's heard of him before? Why did he feel such a pull to him? What does he know? All of these questions are answered in, The Onyx Recruit! (Title and cover pending)

Ps: when chapters are first published, they're most likely unedited so be wary.