Andromeni are protected under the Numos Acquisition and Annexation treaty, which covers all planets in the Andromeda galaxy. The treaty states that all planets from the Andromeda galaxy are covered under provision 3128 of the Alliance charter, guaranteeing protection and safety for all subjects living in the entire galaxy who comply with Alliance law. A deadly energy based plague is currently threatening to destroy them entirely. The fate of the race seems dubious with half of the population succumbing to the disease during the past five years. While on Plias, Andromeni can live for several years, but as soon as they leave the system, their form rapidly decomposes. No cure has been found and the Andromeni face extinction. However, a small percentage of Andromeni are able to manipulate their form, allowing them to enter and control a recently dead body. The survival of the race depends upon these few beings.

Andromeni are able to exist as energy, appearing as sparkling auras of light, oscillating in size and changing in hue from bright orange to deep red. Color changes depending on the emotional state of the being. While in their natural state, they may pass through walls and other solid objects.The thickness that these creatures can penetrate is based on the relative density and composition of the object.

The energy given off by Andromeni while in their energy state is quite dangerous to themselves. These creatures must avoid flammable gases and liquids. An Andromeni which is in close proximity to highly flammable materials such as gasoline or hydrogen runs the risk of igniting them.

Andromeni earned their name Energy Vampire because of their innate ability to take over and control living as well as dead bodies. The possession of dead bodies is automatic, although the corpse must be fresh.

The Andromen may also possess live bodies. It moves adjacent to the intended victim and generates a powerful form of Essence Drain. During this time, the parasite is vulnerable to energy based attacks. Often, a person will survive the initial attack and flee. The Andromeni will attempt to follow.

After it has incapacitated its victim, the Energy Vampire then melds with the body, taking over all functions. The victim is trapped, completely aware that his body is being possessed by the Andromeni. The vampire is not able to completely control the host's bodily functions.

Andromeni posses extremely high metabolic functions, due to their energy based nature. Thus, Andromeni burn out the host of the body they inhabit in short order. The body begins to wither as it is consumed. Eventually it shrivels up and the parasite must find a new body or risk dying. While linked to another body, the creature is completely susceptible to all forms of attack.