Seylon was a guardian who served the Arratu. They encountered Phasma and her team[1] in 24 ABY.[2] After the Arratu's death, Phasma and her team escaped from Arratu Station and killed the guardians who were in charge.[1]
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↑Star Wars: Timelines dates the events of Phasma to 34 ABY. As Seylon encounters Phasma in a chapter set ten years before the present day events, it must have taken place in 24 ABY.