The Ryuusazai is a creature that lives in the 6th Layer of The Abyss where return is humanly impossible.
First documented in the notes of the white whistle Lyza "The Annihilator", it is a creature resembling a horse with a long neck and what appears to be a peak. Its skin is covered in scales like a reptile, making it an odd mixture of different kinds of animals. When it receives an impact, its scales will break off. Furthermore, they're laced with a dangerous poison.
Males often engage in fights with one other, tackling each other tenaciously ignoring the curse and moving in a three-dimensional manner. Its towering size comparable to that of a large dinosaur makes for an imposing figure, and they're considerably strong creatures, with their danger level rivalling the Kuongatari and the Tamaugachi. They don't appear to be particularly violent however, so if not provoked a safe passage is feasible even around their vicinity.