Vortigaunts

Vortigaunts, nicknamed Vorts by humans, are a bipedal race of sentient humanoids from an unknown world conquered by the Universal Union unknown eons ago. They are naturally accepting and empathetic creatures, and made the most of their use as workers. But once the Union learned of their abilities and power, tried to turn them into front line soldiers. This lead to more oppression to their species - oppression they could no longer stand. On one invasion, they made their move, and tried to rebel. They were utterly decimated by the Union in the conflict, and after it was all over they were to be made an example of. Vortigaunts were made slaves of the Union, menial laborers worked until their death.

With the Invasion of Earth, Vortigaunts were sent in large numbers as slaves because Earth's conditions were similar to their home-world. Here many saw their chance, escaping their captors and joining the Resistance, where they proved invaluable.

Vorts are extremely powerful and wise creatures. They can communicate telepathically between individuals, and generate/project electricity from within their bodies. They also seem to be natural healers, of just about any species. The Vortigaunts also seem to be more in tune with the multiverse than other creatures, allowing them to sometimes have knowledge that in most situations would be impossible to obtain.