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Ossomer was Slately's youngest son, and as a shining example of what a Jetstone Royal was expected to be, favored by his father.
It upset Slately greatly to see Ossomer Decrypted and on the side of Gobwin Knob, which when coupled with Ossomer's already conflicted feelings about his new Side and their tactics, helped him to turn back, something completely unknown for a Decrypted to do before.
Slately and Ossomer bonded one last time fighting Gobwin Knob's Archons, before Ossomer was dusted.