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The Combine Advisors are the face of the Combine Empire, suggesting that they are probably the original master race behind the alien empire. They briefly appear in the game, in Doctor Breen's office, on giant monitors, and they can be seen several times during Episode One. Physically, they resemble large grub-like creatures, belonging to a species which most likely passed its singularity long ago. As a result of their expertise in developing advanced technology, the Advisors have evolved to an artificial state which is undoubtedly vastly different to their original physical state. They seem to be unable to manipulate objects or move around on their own, they are virtually blind, and they have a large number of other physical handicaps. As a result, the Advisors are totally dependent on their highly advanced technology in order to survive, and are probably unable to live without their mechanical aids. However, because of their life support, they have reached a technical immortality.
In Episode One, they are shown preparing to evacuate themselves from the damaged Citadel while their soldiers and other minions are ordered to destroy the Citadel's dark energy reactor to send an unknown message to the main Combine "nation". This clearly shows they are at the top of the known Combine hierarchy, as their minions have no chance to evacuate once the reactor begins to detonate, whilst their escape pods ensure they can flee to a safe distance.
In terms of size, an Advisor is about as large as a rhinoceros. They move using a form of advanced hover technology, possibly the large blue glowing devices on their backs. Despite their obvious intelligence and technological expertise, the Advisors are virtually featureless, with no visible eyes, ears, mouth, or limbs, explaining their many mechanical augmentations. As their natural eyesight is so poor, they rely on a vision enhancement device, and in order to help them breathe, their faces are covered by what appear to be respirators, from which a hose leads to a tank. Advisors rest inside a metal cradle which has two mechanical claw-like arms protruding from the upper section. Each Advisor wears a stitched olive-green body suit, leaving only the mostly featureless face and part of their tail fully visible. The suit also has a black collar adorned with golden hieroglyphics on it, possibly the original race's form of writing. There is similarity in both the colour and texture of the Advisor's body to that of the Nihilanth, the original game's final boss. This may or may not have been intended.
Despite their crippled physical state, the Advisors have become highly evolved mentally, and are capable of telepathy and telekine***. Slashing animations revealed by the Half-Life 2 Model Viewer suggest that the player may have been intended to fight one of these creatures, most likely as a final boss.
In Half-Life 2: Raising The Bar, designer Ted Backman mentions that the immense, worm-like form of the Combine Advisor was inspired by the work of Frank Herbert, most likely the images of the Spacing Guild Navigators and Leto Atreides II from the Dune novels.
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