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Race-X was compromised of a multitude of alien creatures, mostly somewhat humanoid warriors, seen in Half-Life: Opposing Force. Race-X has not been deemed canon by Valve.
- Shocktrooper: Basic infantry of Race-X, Shocktroopers are armed with 'shockroaches', and can spit an explosive substance as a grenade.
- Voltigore: Heavy artillery of Race-X, Voltigores fire beams of purple lightning at their enemies. Their electrical powers are so volatile that Voltigores explode upon death. Baby voltigores do not seem to be fully developed, as they have no electric powers and simply collapse when killed.
To do: Add more information on the Race-X faction and their role in Half-Life: Opposing Force.