The Cabal

The Leviathan Empire is an organization that took over the Forerunner territory after their disappearance 101,000 years ago. Coming directly from the Andromeda galaxy, the Leviathan Empire archived a tier 1 technological step challenging both the forerunner and Precursor civilization. For over 100,000 year they ruled over an Empire of over 3 millions worlds in the far side of the milky way outside the unsc range. After the defeat of the didact they took the chance to take over the remaining of the Forerunner empire i.g. The UNSC, Covenant, and asiaguard territory in what it is called the War for the Mantle of responsibility.

Biology
The Alien race know as Leviathan are humanoid like, 2 legs, 2 feet and four mandible mouth. the average heigh of an specimen is 8ft 5 inch. Power full, they have as much as strength as an health Sangheilian. Like human, they have 5 finger and use it the same way a primates does. Unlike any other species in the galaxy they have the most developed cranial vault and their brain is the most developed even cataloged. This brain allowed them to developed advance technology and colonizing over 3 millions worlds.

Weapon's technology
The weapons technology used by the Leviathan empire is very close to de human in the design. However, the munition is something totally new compared to the covenant/asiaguard/unsc technology. It use a powerful highly unstable type elementary particle the Boson of Higg close to the hard light technology of the Forerunner but more powerful. The munition's magazine as to be manipulated and take the sharp of an cylinder with only a few exception. This new kind of technology is also used by their ship.