The Empire of Death was created by Akingi. It is more like a country or empire rather than an organization. It's leader is Akingi, who was originally Toa Katphish. When a mask from another universe fell to the Matoran Universe, it chose Toa Katphish. For reasons having to do with the Kanohi Akingi's Universe, Toa Katphish/Akingi began to kill Toa and proclaim himself leader of the universe. Akingi's "Empire" consists of escaped Prisoners from the Pit, Skakdi, Dark Hunters, Toas who survived Akingi's slaughter, a few Makuta, Shadow-Matoran, Exo-Toran and other beings.