Obscurers are technological devices in the Lost Cities, created by Lady Iskra. They hide a person or a small group (if they are close together) from others by bending sound and light around the user like a force field. All anyone can see or hear is wind and a slight distortion in the air, like heat waves radiating off the ground.
They are used by Sophie Foster and her friends when they visit Paris and a couple other times when they want to hide. The Neverseen used them in Paris to hide themselves, Sophie, and Dex from human eyes during a fight on the bridge in Keeper of the Lost Cities. In Everblaze, Keefe and Sophie saw them surrounding her old house in San Diego.
They used it again in Legacy to help disguise themselves in London.
An obscurer resembles a small black orb with thin silver swirls curling around it. It is about the size of a human or elvin palm.