Yūgure Blood Oath

Utilizing this technique Rika is able to break down the barrier between her two chakra systems, the one utilized by shinobi and the one used by Yūgure. By doing this the user is able to drastically increase their abilities as chakra permeates their entire body. Utilization of this techniques allows Rika to use both of her sources of chakra simultaneously for either Yūgure techniques or ninja arts, removing many of the limits placed upon her under normal conditions. Additionally her physical abilities are greatly increased while under this state since much more chakra is flowing through her muscles. Upon activation of this techniques sensors will report an increase in the level of the user's chakra which feels colder than usual, though this is just a result of the user's stamina being converted into chakra at a greater rate and the influence of the Yūgure. Due to this increase conversion rate the user is able to perform techniques at a much quicker but also expends chakra continuously as long as the mode is active.

While the use of this technique is quite beneficial it causes Rika to act more on instinct and emotion than reason, which makes her potentially a risk to herself and allies caught in the crossfire. She has displayed the ability to keep this technique active for nearly twenty minutes, after which she collapsed due to exhaustion and required several days to recover. In addition to the exhaustion correlated with this technique, Rika has displayed signs of physical strain after its utilization, likely due to body's unnatural vitalization. While this technique officially has a hand seal associated with it, it is simply used to facilitate the chakra permeation. As such an extreme traumatic event could activate this technique against Rika's will, as seen when her mother was mortally wounded. Rika has shown to utilize the power of this technique in short bursts in order to amplify her techniques as needed, which has proven to be less strenuous on the user's body and chakra reserves.