Advisors
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Advisors (also called Vortigaunts like Shu'ulathoi, apparently this is their race's real name) are the main figures in the Alliance, which can define them as the primary ruling race of the Union of Universes, the race that initiated the formation of the organization. In Half-Life 2: Episode One, it is shown that before the evacuation from the Citadel, the Advisors order the staff to send a certain message to the Alliance's capital world. This also confirms that the Advisors are, at the very least, on one of the highest levels in the ruling hierarchy of the Alliance, as they ordered the sacrifice of the entire Citadel for the transmission of this message, and only when they themselves are evacuated and are in safety.

Externally, the Advisors look like enormous larvae, belonging to a species that probably emerged very long ago. As a result of many experiments that provided them with advanced technology, the Advisors have transitioned to an artificial form of development, which surely is very different from their former appearance. By giving themselves such cumbersome physiology, they have undoubtedly lost the ability to move and manipulate objects independently. In size, an Advisor is comparable to an adult rhinoceros.

In Half-Life 2: Episode Two, an Advisor moves using anti-gravity devices (large mechanisms on their backs that glow bright blue). They can also quite nimbly crawl using artificial manipulators. Before Half-Life 2: Episode Two, they moved exclusively on personal aircraft-like transports. There, it is also possible to notice how such transports move on a bridge using military APCs.

The Advisors practically have no distinguishing features among themselves: they lack visible eyes, ears, mouths, or limbs. This likely explains the large number of mechanisms they carry with them. They have no eyes; however, there are devices resembling eyes on the left side of their