Directorate Bioweapon 01AZ, codenamed Daedealous Leviathan, or simply referred to as Leviathan by UNSC forces, was a series of genetically engineered bio-lifeforms that were created by the Saulosian Directorate Department of Biological Research and Development. The bio-lifeforms were semi-sentient organisms developed through extensive years of research concerning aquatic predators.