Big Chief

Big Chief (ビッグチーフ) is the spirit of a Patch Tribe chief and serves as the Guardian Ghost of successive chiefs.

About
As chief, he led the Patch Tribe through turbulent times, and his power and ability stood out among the tribe's heroes. Rather than die to an illness, he chose to use a secret tribe technique to become a Seirei and continue protecting the tribe. During this process, his mask fused with his soul and now cannot be removed.

O.S. Big Chief
Description: By placing the Big Chief within her pipe, the spirit of the former Patch Tribe chief materializes around her body. Due to its large size, when forming this Over Soul, Goldva jumps into the air, crossing her arms while holding her pipe. Once complete, it takes the form of a muscular humanoid armor for Goldva to wear around her body, with a large iron ball in place of its right hand. In this form, it becomes gigantic, even as large as one of the Five Grand Elemental Spirits, and has the head of a Thunderbird with the common Tribal Chief headdress. It also gains waist and wrist armour.
 * O.S. "Previous Patch Chief, Big Chief" (O.S. 先代パッチ族族長ビッグチーフ Sendai Patchi-zoku Zokuchō Biggu Chīfu)
 * Shamans: Uran-Uran, Goldva
 * O.S. Type: Spirit Type
 * Spirit Ally: Big Chief
 * Medium(s) Used: Ceremonial pipe

It was first seen when Redseb and Seyrarm Muntzer invaded the Sanctuary of the Great Spirit and attacked Asakura Hao with their Golem. After Hao stopped the Golem, Goldva punched it, smashing it against the floor.

Anime/Manga Difference
Because the anime ended a lot earlier than the manga and the fact that the entire second round of the Shaman Fight is completely changed in the anime, the Big Chief had never had its appearance in the anime.

Trivia

 * The general appearance of the O.S. Big Chief largely differs between the first appearance in the manga and later depictions in the series.