Summoning Technique (HBH)

The Summoning Technique is a space–time ninjutsu that allows the summoner to transport animals or people across long distances instantly and uses blood as a sacrifice.

Contract
Before an animal summoning can be performed, a prospective summoner must first sign a contract with a given species. The contract comes in the form of a scroll, on which the contractor uses their own blood to sign their name and place their fingerprints and once signed it is valid even after the contractors death as long as the contract itself remains intact. After this, they need only offer an additional donation of blood on the hand they signed the contract with, mould their chakra with hand seals and then plant the hand they signed the contract with at the location they wish to summon the creature. The amount of chakra used during the summoning determines how powerful the summoned creature can be. It is possible for a summoner to summon a group of the same contracted animal, as opposed to a single individual.

It should be noted that anyone can summon a contracted animal as long as they have the blood of someone who has made a contract, the seal of the summoned creature and a source of sufficient chakra that the summon will accept. A creature is capable of determining who is attempting to summon it from the chakra used.