While the medallion is around your neck, you have darkvision out to a range of 60 feet. If you already have darkvision, wearing the medallion increases its range by 30 feet. Also while wearing the medallion, you can sense the presence of any fey, fiends or undead within 60 feet of you, if you sense any of those creatures close to you, the medallion starts to hum and vibrate. You also can cast shield (Quen), suggestion (Axii)(DC 15), burning hands at 2nd level (Igni)(DC 15), glyph of warding (Yrden)(DC 15), and thunderwave at 2nd level, and isn't super loud (Aard)(DC 15), once you cast a spell from the medallion, you can't cast that spell again untill the next dawn.

Notes: Sense: Darkvision, by a Witcher, Detection, Necklace