| Mentioned-only characters
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| Characters mentioned in Underrail and its expansions, but not making a direct appearance
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| Hollow Earth
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| Old Biocorp
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| New Biocorp
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| Protectorate, United Stations
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| Tchortists
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| Free Drones
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| Hathorians
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| Arena
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| Core City
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| Foundry
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| South Gate Station
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| North Underrail
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| West Underrail
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| Lemuria
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| Others
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