OVERVIEW:
Archesian amulets are extremely rare magical necklaces that grant their wearers protection and immunity from the influence of various magical objects. Upon being hired, Jesiba Roga gifted one to Bryce Quinlan. Bryce's amulet is described as "a knot of three entwined circles... barely the size of her thumnbnail," (Chapter 2).
Danika refers to the amulet as a "hazmat suit in a necklace" and warns Bryce never to take it off (Chapter 2).
SPOILERS AHEAD:
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Towards the end of Book 1, we learn that Danika warned Bryce never to take off her amulet because she knew it would prevent her from accidentally using her power on the Horn.