Black Flash

You are blessed by the sparks of fate. When you land a critical attack you can draw on a black flash to unleash an attack of sheer destructive potential granting you both incredible power and focus.

Upon taking this feat you gain the following features:

• You raise your unarmed damage die by one damage tier (Ex> 0 -> 1d4 -> 1d6 -> Etc.).
• When you score a critical hit with an unarmed strike you deal additional force damage equal to your proficiency modifier to the power of 2. (Ex: Prof of +2 grants +4 force damage)
• After landing a black flash you enter The Zone for 1 minute. While in The Zone you gain +1 to attack and damage rolls and score a critical hit on a roll of 19 or 20.

While in The Zone you must concentrate similarly to how a spell caster must concentrate on a spell. The Zone ends early if your concentration is broken.

At level 5 and on you gain the following benefits:

• The damage die bonus to your unarmed strikes becomes X tiers.
• While in The Zone you gain +X to attack and damage rolls. While in the Zone and you land another black flash your critical range decreases by one after every black flash a to maximum number of times equal to X. (Ex: if your proficiency bonus is 3 and you've landed two black flashes within a minute you can score a critical hit on a roll of 18-20.)
  
  X = Proficiency Bonus - 1