Gōdō

Gōdō (合同, Fusion) was an archaic, dangerous, and highly forbidden ritual-based Kidō technique taught to Van Satonaka in the years after the by an unknown and highly mysterious old drifter in the. Van, with help from Kenji, greatly improved upon the technique as a trump-card for use against Averian.

Description
The only goal of this ritualistic spell was to temporarily fuse two individuals in order to create a single individual with far greater power than either fusee possessed on their own. Van used the spell once alongside Kenji Hiroshi to combat the real Averian towards the end of the First Spiritual War, creating an entity known as Shiba Satonaka. Shiba possessed enough individual power to turn the tables on and eventually force Averian to retreat, becoming the first to do so unaided since Garian Shinjo centuries prior.

Ritual
The ritual, as noted by Van, was simple in theory but complex in execution; a single misstep could very well result in death or, failing that, the loss of your spiritual powers. Van was also unsure of the side-effects. The two practitioners enter into a state of meditation akin to, with the leading fusee placing their hand on their partner's chest. Entering their partner's Inner World the two fusee's attempt to synchronise their powers perfectly, which takes the form of a crystalline prism. When the prism shatters inside the Inner World the two are either drawn together and merged, or flung apart.

Improvement

 * Kyōdōsensen (共同戦線, United Front) -- a spell belonging to the Nigendō branch of Kidō techniques created by Kenji and Van. It allowed the two to pool their strength and knowledge to fight as one entity without the dangerous side-effects of the original Gōdō, though Garian still labelled it forbidden.

Downsides
Although a potent technique Gōdō is not without its downsides, some of which are quite unpleasant. Failure to properly synchronise one's power with your partner can result in the total loss of spiritual power. The spell is also highly unstable; Kenji later remarked that the gamble Van and he undertook when using it was incredibly high, for Van was unsure if they would even be fit to return to their original forms.

Known practitioners

 * Van Satonaka.
 * Kenji Hiroshi.

Behind the scenes

 * This spell was based highly on the Fusion Technique depicted in Dragon Ball Z.

Trivia

 * When the subject of fusion was first raised by Van, Kenji stated that he was on-board so long as he "didn't have to prance about like a fool".