Gedo Juubi

Gedo Ten-Tails (外道十尾, Gedō jū-bi) is the empty vessel of the Ten-Tails. It was sealed within the moon by Hagoromo Ōtsutsuki — the Sage of the Six Paths — where it remained until Madara Uchiha awakened the Rinnegan. This allowed him to break the seal and summon the body, where it would be later used by Cloud, Obito Uchiha and Nagato as the container for the tailed beasts that were captured by the members of Kuro Akatsuki. The Gedo Juubi was upgraded into the Mobile Armor, Apsalus Dragon.

Appearence
Gedo Juubi is a giant, earthen-coloured humanoid entity with most of its body looking decayed. It has single eye, which takes up most of its head, is a red-coloured Rinnegan containing several tomoe.