Bright Irons

The Bright Irons are a cult created during the Apocalypse, where the followers pray the never ending sun, and wear animal shaped Iron Masks.

Some high placed members have a featureless and smooth face behind their masks.
We suspect that The Entity is tied to them, as Persy became a host after interacting with their mask (and also became faceless and without control at one point, similar to these followers).