Ice Warrior Hive
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This topic might have a better name.
Shouldn't this be named Ice Warrior Hive, as they have also been mentioned in singular on the episode?
Talk about it here.
The Ice Warrior Hives was an Ice Warrior colony on Mars.
The Twelfth Doctor suggested to Clara Oswald to go there as an alternative to visiting Robin Hood. (TV: Robot of Sherwood)
The Doctor later travelled there with Nardole and Bill Potts to stop Victorian soldiers from awaking the Ice Warriors, as well as the Ice Queen Iraxxa. This, however, failed and a battle between the humans and Ice Warriors broke out. (TV: Empress of Mars)