R-4913 and X-8973 are Vortigaunts from Half-Life: Decay. They appear in the bonus chapter Xen Attacks which can be unlocked if the player manages to obtain an A rank in all of the regular missions.
In the mission, the Nihilanth has assigned R-4913 and X-8973 to retrieve the crystals stolen from Xen by the Black Mesa Science Team (although it is later revealed that the crystals were actually stolen by the G-Man). Both Vortigaunts are able to regain health by damaging objects or enemies, supporting the theory that Vortigaunts can drain lifeforce/energy with their beam attacks.
Trivia
- In the unofficial PC port, both Vortigaunts appear with a crowbar when looked at by the other player, while they both use only their claws and electrical attack, as any Vortigaunt. This is likely an unintended glitch.
- In both versions of the game, the words "Valve" and "R-4913" are found in an air duct written all over the walls in the mission Code Green. These words are also found in a vent towards the end of Half-Life: Uplink.
List of appearances
- Half-Life: Decay (First appearance)
- Half-Life: Uplink (Non-canon; Mentioned by name; R-4913 only.)
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Creatures | Alien Aircraft • Alien Controller • Alien Grunt • Armored Headcrab • Barnacle • Boid • Bullsquid • Chumtoad • Fast Headcrab • Gargantua• Gonarch • Headcrab • Houndeye • Ichthyosaur • Leech • Lightning Dog • Nihilanth • Poison Headcrab • Protozoan • Snark • Standard Headcrab • Tentacle • Vortigaunt • Zombie |
Flora and minerals | Crystal • Fungus • Healing Pool • Light Stalk • Trampoline • Tree |
Weapons | Black Hole Gun (cut) • Ceiling Turret • Grenade • Hivehand • Sentry Cannon • Snark • Snark Mine |
Technology | Healing Shower • Thumper |
Creatures (cut) | Archer • Charger • Fast Walker • Flocking Floater • Kingpin • Mr. Friendly • Panther Eye • Prrobot • Sand Barnacle • Snapbug • Sphere • Stukabat • Unidentified Quiver Creature |