|Size||12m ~ 30m|
|Manga Debut||Chapter 269|
|Anime Debut||Episode 197|
The Cloud Spinosaurus is a Cloud-attribute Box Weapon that merges the body of its user with the power of the Spinosaurus through the Boxes of Carnage. The Spinosaurus that served as the base was a carnivorous dinosaur with a sail made of skin on its back. Its figure, in which multiple heads have split up by Kikyo's Cloud Flame Propagation characteristics, have already went beyond the original and its dreadful appearance and has overwhelming power, which is said to be one of the goals of the Box Weapons.
After opening the Cloud Box of Carnage, Kikyo becomes a hybrid between human and Spinosaurus with Cloud Flames flowing out of his shoulders and hips. In this state, not only his physical abilities are increased, but his hair becomes much longer and its ends transform into Spinosaurus heads. These heads can maneuver around and even extend themselves to reach the enemy and sink their teeth into his or her body. They are also able to drill bellow the earth in order to perform underground surprise attacks.
- Divisione Testa: Due to the Propagation factor of Kikyo's Cloud Flames, a single Spinosaurus head can split itself into two complete heads. By repeating this process infinitely, an army of Spinosaurus can be easily created.