Obsidian Rasenshuriken

Obsidian Rasenshuriken is the ultimate collaboration technique of the Obsidian Companions. A technique meant to be a battle stopper, it is commonly used to deal with dangerous opponents in a quick and timely manner. By combining Water and Lava energy, the users begin rotating the two until a sphere of pure obsidian is created. While this is going on, Kisui begins pouring in more Lava energy into the center, specifically in the interior, to create an active core of magma. This magma has a sort of fan shape to it, which causes the obsidian sphere to envelop four blades to give it the signature Rasenshuriken look. Once the trans formation is complete, the Rasenshuriken is handed over to Kisui, who hurls it at the target. Upon contact with an object or person, the Rasenshuriken explodes, sending out sharp shards of oblivion, leaving the magma core exposed. This core pulls on the shards, sending them back to their point of origin, skewering anyone or anything near that point that survives the magma core's exposure.

Dracbacks
Because it has such a demanding energy source, a lot of chakra is required by both users to create the Rasenshuriken. The majority of this chakra is spent rotating the energy, which can be difficult at times as they have to both rotate energy signatures each one aren't familiar with, Water energy for Kisui, Lava energy for Kosui, during the rotation. If interrupted, the entire process has to be done again, which wouldn't be possible as both Kisui and Kosui would be too drained to form another one. It has a no discrimination area of effect, meaning anyone in the field, even allies, could be injured or even killed by the Rasenshuriken, so a lot of effort must be taken to ensure the Rasenshuriken's path is away from any potential allies.