Dark chakra manipulation

this jutsu is a ninjutsu which uses taijutsu, when used, this jutsu transforms the users blue chakra into dark black chakra which is more demonic and can make almost any jutsu used with this chakra 5 times stronger.

variations
the original version of this jutsu was used by jai uchiha who developed this jutsu himself. it was only to change the colour and power of the chakra and jutsu's, but yahiko altered his version.

yahiko's version is similar but he can manipulate it in a similar way that jai can manipulate the lightning transformation and black lightning transformation. yahiko can almost create a beast with the dark chakra, but he mainly uses it for the power of the chakra, the same way jai does.

side-effects
after sustained use of the dark chakra, the user will experience increadible chakra loss and head aches, they will also experience dizziness and loss of balance. these side-effects can last up to 24 hours. the dark chakra will stop when the limit of the person has been reached, at this point, the user could experience fainting or even death.if the jutsu was only used briefly or for a short amount of time, the side-effects either wount show or will be to weak to feel.