Jigokuken

Jigokuken is a type of chakra blade with affinity to the Wind Release style. It takes the form of a common ninjato, with a seal carved on the adamantium blade, next to it's hilt. Differently from common chakra blades, Jigokuken doesn't require the wielder's chakra to perform it's techniques, but is somehow connected to it, since the user needs to pull it's chakra out with their own chakra. If the user dies or if their chakra reserve is too low, it will probably block the acess to Jigokuken's infinite chakra resource, turning it into a very good and simple ninjato. To wield Jigokuken with mastery, the user must have a comprehension of the Wind Release Style, or it will only become a mere chakra weapon in that person's hands.

Jigokuken doesn't have a common scabbard. Once it's connected to it's user, the user must have the summoning seal on any part of it's body, becoming the scabbard of the sword. To pull it out, the user must focus some chakra on the seal, activating Jigokuken's own chakra and pulling it out of their skin. If the user doesn't need it anymore, they can focus the chakra on it's hilt, making it vanish. An advantage of it's trait is that it can be summoned at anytime and how many times the user wishes, even during a battle.