(Still very much WIP, especially on the design front!)
A newborn being of pure energy has come to the station, drawn both by curiosity and the enticing power flowing through its machinery. They desire only to feed, grow, and learn, but the crew may find this interfering with their work... and safety.
As creatures of energy, Luminaries are not subject to many physical restrictions, enabling them to travel through the station's electrical fixtures such as lights, computers, and consoles (though only powered and unbroken ones). They are also immune to most forms of attack, and in fact absorb fire and energy projectiles; though disablers, ion rifles, and temperature guns on low settings are effective. Those wishing to stop a Luminary will likely have to use different tactics than a guns-blazing chase, however.
On the other hand, Luminaries by default have no directly harmful abilities. Even their melee attack only does stamina damage. They may sometimes unlock deadlier powers as they progress, however...
GAMEPLAY
Luminary objectives include gathering a certain amount of power from the station's devices and learning more about the things on board the station (via interacting with certain things in certain ways). As it gains more power and knowledge, a Luminary will develop new skills/powers, likely based on what it has been studying/doing.
Here are powers as designed so far:
Transmission: The Luminary's most basic ability, incorporeal travel via electrical devices. Works similarly to bloodcrawl.
Galvanization: Finding a dead creature, the Luminary probes its internal energy pathways and figures out a way to restore the flow, reanimating the body with a surge of energy. Corpses missing hearts or brains receive a couple... improvisations. Reanimating humanoids may count towards a learning objective. A corpse with no owner becomes eligible for ghosts, which creates a new mind with no memory of the body's original life. Such beings may or may not receive objectives (as some kind of reanimated minion, probably), needs discussion.
Assimilation: The Luminary feeds itself into various machines and computers around the station, learning how to use/mess with them. For instance, entering an autolathe. Another probable research objective.
Network Lance: One of the Luminary's few offensive abilities. Having studied the powernet, the Luminary directs it against a single (or not?) target, causing arcs to strike them from nearby machinery. More machines nearby, more arcs, more damage.
Lightning: A non-damaging variant. The Luminary discharges chain lightning, stunning nearby humanoids.
Translation: The Luminary gains the ability to pull an incapacitated (or willing?) target into the airwaves with it when it transmits.