You are either Aggressive or Cowardly (your choice). You can change which of these you are during a short rest.
You will not leave combat willingly and are inept at not killing anyone who opposes you.
Trigger: You are hit by an attack. This triggers automatically. You cannot choose to not use it if you are able to.
You become frightened.
End condition: At the start of each of your turns, you roll 2d4. If either of these dice roll a 4, this effect ends.