Invulnerable En Tao
The group of Shamans finally meets Ren's uncle, En Tao. Nonetheless, not even their best techniques seem to harm the enormous man; to defeat him, they need to figure out the secret behind his invulnerability.
Aired 12/12/2001EP 24 - Invulnerable En Tao

2001
Shaman King
Shamans possess mysterious powers that allow them to commune with gods, spirits, and even the dead…and Manta Oyamada's about to learn all about them, because his class just welcomed a new transfer student: Yoh Asakura, a boy from way off in Izumo…and a shaman in training!
(Source: Kodansha USA)