Blindfighting Sentinel is a heroic tier feat available to all player characters.
Normally, a character grants combat advantage to enemies the character can't see, and a blinded character takes a −10 penalty on Perception checks. A character that has the Blindfighting Sentinel feat does not grant combat advantage to enemies due to blindness or invisibility, and does not take a penalty on Perception checks while blinded. Additionally, the feat grants a +2 feat bonus to Perception.[HotFK:310]