Availability: Any type of fighter class.
Duration: 3 turns.
Starting at 5th level, you gain the ability to enable your fighter spirit. You can use this ability once per every fight. It lasts 3 of your turns.
It allow you to roll you damage dice twice, and you have advantage on rolls against any creature, besides undead.
After the three turns have ended, you opponent has disadvantage on any rolls for it's next 4 turns.