This summoning is a forbidden technique used to revive the dead. Kabuto mentions that Tobirama Senju and Orochimaru were the only ones who knew how to use this technique, and Kabuto now claims to have mastered it to a degree even higher than them. Before the technique can be performed, a living sacrifice must be found. The sacrifice's body is used as a vessel for the soul of whoever is being revived, with dirt and ash encasing them to resemble the original body of the person being resurrected. The end product is stored in a casket until summoned by the user.
When Orochimaru used this jutsu, he sacrificed Kin Tsuchi and Zaku Abumi to revive Hashirama Senju and Tobirama Senju. Kabuto used it to resurrect Itachi Uchiha, Sasori, Deidara, Kakuzu, and Nagato simultaneously.