Vicious Focus

Heroic Deed: Vicious Focus

Available only to the core Fighter class at 6th level and above. When you reduce a hostile creature to 0 hit points or score a critical hit, sacrifice a Risk Die and make a DC 11 Strength or Dexterity check. If the check succeeds, you enter a zen state of battle for 1 minute. For the duration, your weapon attacks score a critical hit on a roll of 19 or 20.

Each time during the duration that you reduce another hostile creature to 0 hit points or score another critical hit, this critical hit range increases, first allowing your melee weapon attacks to score a critical hit on a roll of 18 to 20, then on a roll of 17 to 20, etc. If you fall unconscious, this effect ends early.