Blindsight

Type of Feat: Class
Prerequisite: Eye of Gruumsh
Some creatures have a special sense (smell, vibration, etc.) that allows them to detect creatures that are near them. This ability can see through invisibility, darkness, and most other types of concealment. It does not allow them to detect ethereal creatures and its range is limited to the specified distance. For an Eye of Gruumsh, this distance is 5 ft. radius at level 5th level and a 10 ft. radius at 8th level.