Every time you take damage while having half of your total hit points (rounded up), roll one d6. On a roll of 1, your survival instinct overrides your natural code.
Your unarmed attacks gain an additional 3 (1d6) lightning damage. Once per long rest and during your rage, you can extend your palm outwards and project a 15-foot cone of lightning. Targets in the cone take 8 (2d8) lightning damage and are stunned until the end of their next turn on a failed DC 13 Constitution saving throw. You have an extra 15-feet of movement during your rage state, and advantage against being stunned or knocked prone.
At the end of your turn, roll one d6. On a roll of 1, you revert back to your calmed state as your mind conjures a memory of the past. Your rage state persists until you roll a 1 or are incapacitated.