Boil Release: Boundless Curse

is an utilisation of Boundless Vapour that expresses the addition of to. In this technique, the substance has become a "slimy" substance that Hōsōshi created with applying a different ratio of "yang" to it. With it, Hōsōshi can use it in close-ranged combat on singular — or multiple — opponents by "throwing" it at them or infuse it into his hand-to-hand style. Consequently the technique can be coated on Hiroseike to apply it in the wounds of his victims, directly forcing corrosivity in it.

Each successful strike or hit will increase the pH-level of the technique. Extended exposure to it can be fatal for the victim. It's seen that with a singular opponent the technique is quite deadly, allowing Hōsōshi to perform a "face-palm"-move to instantly raise the pH-level of the slime. Potentially, users could reduce the effects of the technique and eventually wash it off. However, Hōsōshi could counter this — focused on that target — and absorb the water to empower the technique.