This is the (tiny) icon from the quest item slot for the teleportation sphere given to Geralt by Kalkstein and also for the magic sensors given to Geralt by Triss Merigold in The Witcher.
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Using these probes, mages (and sorceresses) can detect magical anomalies. Geralt receives three...
In the game, Places of Power are (nearly) invisible spots where magic is concentrated. They are...
"A teleportation crystal. Destination unknown." The teleportation crystal is a magic gem given...