Band of Shrouds (CR)

A magical ring that protects the wearer, all the creatures within 60 feet of the wearer, and their possessions from most divination magic that would locate them, including Scrying. 

Critical Role: During a meeting of the Dawn Marshals of Vasselheim discussing what to do about the approaching Vecna, Highbearer Vord loaned his band of shrouds to her. However, the band required attunement, leaving a gap when Vecna was able to scry on the group during the meeting.

The band's protection also did not cross from the Ethereal Plane to the Material Plane, as Vox Machina discovered after applying the oil of etherealness to Vex'ahlia, exposing Vax'ildan's location to Vecna.