A sigil is a type of symbol used in magic as a signature for demons or other entities and sometimes describes the goal of the user; the outcome of the spell it composes. The first sigil seen in the series was in the episode Heather. Amelia Blake placed one on the wrist of her friend, Heather Barnes, after a demon had entered her body sixteen years ago during the night of the Boatyard fire. Years later, Cassie wanted to find out what had happened to Heather, since Zachary Larson attacked...
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