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In Half Life 2: Episode 2, Gordon Freeman ventures deep into an antlion colony with the help of a Vortigaunt ally to find a chamber of unhatched larvae with which to produce the extract. The larval extract is apparently a powerful energetic medium, allowing Vortigaunts to manipulate the Vortessence, which they use to save Alyx Vance from a mortal wound she receives from a Combine Hunter.

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