I'm a Behemoth, an S-Ranked Monster, But Mistaken for a Cat, I Live as an Elf Girl's Pet, Vol. 12 (Manga)

Aria's party makes their way through the sealed labyrinth, finally reaching the dwelling of Belphegor, one of the Seven Great Demon Lords. Her abilities have grown all the more powerful since the old days... Can our heroes come out on top?