Karuse's Jusakū Forms

Karuse Hasogaku is the Jusakū of Shuzaku  — the One-Tail. The beast has a vast amount of chakra, even more so when compared to most humans. Shuzaku's presence inside Karuse allowed him to manipulate sand   and pure dark chakra at will. It was initially thought that Karuse's automatic Shield of Sand and Dark Energy   and Dark Energy stemmed from Shuzaku and the beast's own self-preservation instincts. However both Karuse's father and brother stated that it was in fact symbolic will of "hatred" for his father and "love" for his mother's will that moved the sand and dark chakra after she placed a symbolic seal on her son before dying. Because Shuzaku is said to devour the soul of its jusakū if they were to fall asleep, Karuse has spent up to fifteen years and currently not sleeping at all and when the series started he was driven mostly from a desire for his own existence, and blood-lust, the latter being a trait Shuzaku can easily influence.

Half Shuzaku Form / One-Tailed Transformation
When Karuse became angry after a fight with Suno Yukizake, he slowly slipped into his half Shuzaku form. In this form the gourd on his back slowly breaks down and begins to cover his body, covering his arms, and then his face. His face becomes distorted and it begins to look more like Shuzaku's with yellow eyes and markings around the eyes, he even grows a tail from the gourd which itself functions like a normal tail. In this form, his speed and strength increase. He can use the sand on his arms to stretch his limbs to extraordinary lengths. This form allows him to even fire off his limbs at will, but still have them remain under his control, as he was able to pin Karra Kamichi  to the ground and then slowly crush her as his battle with Tatsuo Satoru continued. In addition, his ability over pure dark chakra increases tenfold. This now allows him to perform certain techniques with the dark chakra as his body in his base form was too exposed to withstand the aftermath of these incredibly strong techniques. Although this is Karuse's first transformation, his abilities in this form grant him access to even more powers as he is able to push his body further into two and eventually four more transformations.