Prerequisite: proficiency or mastery in perception
"Those who believe blindness is weakness quickly learn their mistake. Deprived of sight, you have honed your other senses to a razor’s edge, allowing you to perceive nearby threats and strike them down with unarmed precision."
Blindsight: you gain blindsight out of 15ft. Within this range, you can perceive anything that isn't behind total cover, even if your blinded by darkness.
One-Two: when you make at least one unarmed strike during your turn you can make an additional unarmed strike as a bonus action.
Hardened Knuckles: your unarmed strikes deal 1d6+ your strength or dexterity bonus
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