Heart of the Wild Beast

The is an ancient kind of chakra used exclusively by the Inu Tribe, predecessors to Konohagakure's modern day Inuzuka Clan. Before their village's founding, Inu tribe members and their hounds held a powerful connection to nature. They survived generations within forest among wild beast. Natural energy transformed their inner spirits into ferocious creatures. From birth, their enhanced chakra possessed vicious power. However, the amount of natural energy influencing their chakra was minimal. Making it not enough to truly classify it as Senjutsu. This aggressive chakra granted Inu Tribe warriors savage techniques. They could transform into massive man-beast creatures, into monstrous hounds, perform tremendous transformations and channel their fierce beast spiritual energy, manifesting it physically. Through this Heart, their ninken partners transformations withheld through damage, allowing for continuous beast power. These techniques were eventually domesticated into the Inuzuka Clan's very own hiden. The most prominent example being their Four Legs Technique. Instead of solely amplifying their physical attributes, by accessing an Inuzuka's inner beast spirit, their appearance is altered as well. However, their domestication limited their beast spirit. It is said an average Inuzuka is unaware of their inner self. It is safer this way, as not every Inu tribe member could control their beast. And so, they were driven into madness or insanity, consuming their loved ones. Through their movement from a forest to a village, their inner spirits lost its connection but never truly disappeared. Allowing Inuzuka to draw from it and use wild techniques without going mad. Inuzuka elders labeled drawing out their inner beast a kinjutsu through its dangerous nature. As with any beast, they are severely weakened compared to those who have awakened their inner spirit. Each member possesses a heart. But as they became domesticated, the Inuzuka Clan's connection to this wild chakra grew weaker. Those directly descended from an Inu Tribe warrior possess a greater link naturally. All, including Inuzuka who lack such a blessed lineage, who travel to the Hill of Dogs are able to strengthen their connection through vigorous training, ultimately regaining access to their ancient clans wild energy. Each person's bestial awakening is different. But it exponentially increases their power.

In modern times, in order to awaken this inner heart, one must travel to the Hill of Dogs and meet the great Dog Sage, Yatsufuse. Time inside the Hill of Dogs is reversed. Seven years passes on the Hill of Dogs for every one year outside. Unlike other animal sages, those of Inuzuka cannot access Sage Mode. The sheer amount of natural energy combining with their inner beast would cause them to transform into a wild dog for all eternity. Instead, Inuzuka draw from their inner bestial spirit as a source of natural power. It represents their soul, it is one that grows through their training and determination. Through their inner beast, Inuzuka warriors are able to use their abilities at an unimaginably higher level. Some surpassing their ancestors. Four Legs Technique envelops their entire body in a dog's aura. Their very own natural physical abilities are heightened, also altering their physical appearance. Simultaneously using their clans stronger hiden's at full power without succumbing to various weaknesses. Their Ninken's transformations become more than a simple transformation technique. Whereas a normal Inuzuka's ninken reverts back to a ninken after damage, those who awakened their heart are able to hold their transformations as i it was a real physical form, only reverting at will or low amount of chakra. As demonstrated by Dan Inuzuka, because this chakra holds connection to Natural Energy, those who awaken their inner heart are compatible with Senjutsu collaborations. Their body can handle Natural Energy transferring into their body.