Sparks of Black

Whenever you make a melee attack action, you make a roll of getting a “black flash” which is similar to a critical success. When landing a black flash, the melee attack action is not only critically successful but also, the action doesn’t count as a full action. (Basically a black flash means you get a free action)

At 5th level you roll a 1d20 and if you get a 18 or higher you land a black flash.

At 10th level you roll 1d12 and if you roll a 11 or higher you land a black flash.

At 15th level you roll a 1d8 and if you get a 7 or higher you succeed at landing a black flash. 

At 20th level you roll a 1d4 and if you get a 3 or higher you land a black flash.

You can have a critical success and a black flash at the same time which doubles the effect of a normal critical success.

After landing a successful black flash, you enter “The Zone” which adds a +5 modifier to all of your rolls for 1 round, including rolling for a black flash and your damage rolls.

There is a limit to the amount of black flashes you can do in one round being 4, once you reach that limit you cannot do it again until the next round.