Shadowhunter was one of the three possible dragonets of Clearsight and Darkstalker might have in a possible future. However, she never existed in the timeline the books took place in, due to the fact that Darkstalker was put to eternal sleep by Fathom. Her name was going to be used for Eclipse, as stated by Darkstalker; however, it turned out differently, as Clearsight stated that Shadowhunter was going to be Eclipse's older sister, an argument that Clearsight won with her precognition.
It is possible that this could be a small reference to the book series The Mortal Instruments by Cassandra Clare, which feature warriors called Shadowhunters.
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