Bleach fact:

A Zanpakutō, is the Japanese word for Soul Cutter. This is the weapon used by all Shinigami, Visored, and the Arancar. A Zanpakutō's shape and abilities are based on their Shinigami's soul. Once a Shinigami learns his/her sword's name, they are able to communicate with one another and grow stronger together. Zanpakutō are born with their Shinigami and they die along with their Shinigami..When released, they can display a burst of power. They are one with the Shinigami, and they share a Shinigami's Heart. Jinzen is a  method is the only way to carry on a proper conversation with one's Zanpakutō. One places their sword over their lap and takes a meditative pose and then forces their mind to become one with the Zanpakutō. All Zanpakutō have two levels of release. The first one is Shikai (initial release) and the second one is Bankai (final release).A Shinigami must be able to do both of them to become a captain. Sources: Bleach Wiki. 

Zangetsu, Bankai Form