Eikaishin

is a Kekkei Genkai that allows the user to call upon inhabitants of an alternate dimension. These inhabitants take the form of shadowy figures that can either be miniscule in size or giant behemoths. While the requirements to call these creatures forth is unknown, it appears to be complicated process that is passed down through a bloodline. As of right now, the only user appears to be Zero of Kirigakure. However, for unknown reasons, she is unable to fully control the shadows she brings forth. As well, she seems to forth a motherly connection to some of the creatures she brings forth and calls them her children.

It is unknown if only beings can be brought forth from this alternate world or if structures, animals, or energy can be brought over as well. When the beings are pulled from their alternate world, they rise up from the user like a shadowy cloud and then take shape. It seems to be taxing on the user as they experience some pain and exhaustion after the technique is completed.

One it's most important techniques is. This technique allows the user to bring inhabitants to the world of Shinobi. The other most important technique is which allows the user to bring forth energies from the alternate world and "give birth" to the shadowy beings. This apparently takes a great deal of chakra and stamina to execute and, as a result, the users forms a paternal bond with the being. The shadow being will fully follow any type of command or instruction from the user. As a result, the user has full control of the shadow being.