The ELS are a race of techno-organic sentient aliens that have the unique ability to assimilate nearly all life and technology. They appear as a silver metallic organisms that can take solid or liquid-like forms. While not an aggressive race, their ways of learning and understanding their environment is based on assimilation; by absorbing objects and entities and taking their forms. The ELS has no set form, taking any shape appropriate to their environment and mass. ELS seem to prefer taking the form of technology such as vehicles, mobile suits or spacecraft, but can form metallic imitations of humans or other organic life. When required, separate ELS can combine to imitate larger structures.

Less common than small ELS, the medium ELS are roughly the same size as space battle cruisers, and target battle cruisers or large MAs such as Gadelaza. However, any mobile suits caught within the path of medium ELSs will be instantly assimilated, as opposed to being slowly assimilated by the smaller ELS. They take on similar structures as jellyfish.