Blind combatant

You are unable to see, but this is no hindrance you have learned to live with and even twist your affliction to suit your needs.

• You gain blindsight out to 30 feet if you already have blindsight it increases by 30 feet.
• As a bonus action on your turn, you slow the functions of your body to enhance your hearing while this is active you have advantage on attack rolls against creatures in your blindsight, and they have disadvantage on attacks against you. If you are in this state for a number of rounds greater than your constitution modifier you lose a hit dice for each turn after, If your hit dice hit zero you fall unconscious but are stable. You deactivate this as a free action and can not reactivate this for 1 minute.