Mukōjōchū Muramasa

is a technique of Kōga Kuchiki's Zanpakutō, Muramasa.

Description
Kōga raises his Zanpakutō so that the blade points directly upwards. He then calls out the name of the technique. This causes a massive explosion of purple Reiatsu. As the clouds begin to settle, Muramasa begins to manifest, initially covered in a purple haze which disappears as he becomes physical. Muramasa is now able to use his abilities on Kōga's foes directly. Muramasa can appear wherever he wants due to this ability.