Meiōjū

is a demon that possess a impenetrable shell that has taken blows from Inuyasha's Kongōsōha yet it didn't suffer any damage. Meiōjū was absorbed by Mōryōmaru, who desired the demon's impervious shell as a defense against his enemies, especially Naraku. The only attack known to have been able to breach this shell was Sesshōmaru's Dragon Strike, though his sword broken as a result.

Coincidentally, his seiyū also voices Gōra, who is also a turtle demon.