Blind Fighting

Extensive and continuous training in complete darkness or in some cases with the aid of blindfolds, have allowed you to hone your remaining senses to a razor's edge. This specialized combat training has granted you the ability to perceive your surroundings in ways others couldn't begin to imagine.

• You develop blindsight up to a range of 20 feet.
• Your blindsight can only work in a setting where your character can use his other senses, like hearing and smell.
• You gain advantage on Perception checks relying on hearing and scent. 
• You double your proficiency bonus in the perception skill.