Hikaeseibutsu

Hikaeseibutsu are creatures "created" originally by Tsuyoshi. They were created for a single purpose, which is to supply the wielder with huge amounts of chakra. They were made by collecting a huge amount of chakra in one place, this chakra can be stolen from the enemy of gained by other sources. Regardless, the user uses Creation of All Things in order to create creatures out of this massive amounts of chakra that was gathered earlier. This creature is then sealed within the user in order to serve as batteries that supply the user with a gigantic amount of chakra when needed. These creatures hold an amount of chakra equal or exceeds that of tailed beasts, giving the user all the chakra he needs in battle. If the chakra of these creatures is exhausted, they start to regenerate this lost chakra slowly in order to become full once more and be able to aide the user. These creatures die after five years of their creation, so they should be replaced after their death. Both Tsuyoshi and Kyōsuke know how to create and seal them.