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. They're very strong, with their danger level rivalling the Kuongatari and the Tamaugachi.