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Vortigaunts, formerly known as Alien Slaves, are sentient aliens. Their native home is the Xen border world, from where they were enslaved and then forced to lead an invasion of Earth following the Black Mesa Incident, under the direction of the Nihilanth. Following the death of the latter, they have as a species chosen to ally themselves with the human-led Resistance in its bid to overthrow the Combine rule of Earth. They serve as frequently encountered enemies in Half-Life and allies in its sequels. Read more... Past Featured Articles &middot; Vote for next week's Featured Article