Meiōjū

is a demon that possess an 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.