Masochist

Throughout your countless battles, you've grown accustomed to pain, comfortable with the sensation, others would claim you're not right in the head, you just smile and remove theirs, when you are below half health you gain access to the following features:

• You have advantage on attack rolls against a creature that brought you below half health, or below 0 hit points within the last 10 minutes.
• While in rage, you may use your action to scream with delight, unnerving all creatures who can see you, all creatures within a 60 ft. radius must make a DC 8 + Proficiency + Con Wisdom saving throw or be frightened of you for 1 minute, creatures who succeed on this save are immune to your scream until the next dawn