Alertness

Your ears grow slightly and develop a subtle point over the next few days. When making Perception checks that rely on hearing as a major component, you may add one d20 to your dice polls as if you spent an AP for it, (max 5 in pool). If hearing is at least a minor factor, you may reroll one d20 when making a check this way instead.

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Treatment

Surgery- Plastic surgery can fix this mutation with an Intelligence + Medicine check at Difficulty 2, however a proper facility and equipment will be necessary, and you will lose the bonuses to Perception in the process.