Gyakujutsu

Gyakujutsu (逆術, Literally meaning Reverse Techniques) is a sub-form of Fūinjutsu, based around reversing a chakra source from the target. Not having multiple techniques, it simply reverses chakra sealed into the target. This area of jutsu is what Lei is searching for through all of the Great Ninja Countries, wanting to find someone who can reverse the leeching chakra within him that holds the abilities and drawbacks of the Rinnegan.