When playing a character with Relic Detector you can unhide objects that are indicated by purple sparkles. Relic Detector is a rare ability. There are 2 characters and builds with it.
Laser, Lego Movie World, Relic Detector, and 1 more
Acrobat, Lego Movie World, Master Build, and 1 more
Use the Team Builder to put together a team with all the abilities you want.Go to the team builder now