Eternine
From Tardis Wiki, the free Doctor Who reference
The Eternines were a race that originated from the Eternium.
The Eternines could possess humans, and could remain dormant in their minds, allowing their hosts normal control. In their natural form, they appeared as globes of blue-white light.
When the Eternium was on the brink of death, the Eternines managed to open a pathway between the Eternium and the mainstream universe, allowing Watchlar to pass through. (PROSE: Reckless Engineering)