Card Trivia:The Hidden City
- This city appears in the artwork of "Terrors in the Hidden City".
- This card is based on Shambhala.
- Part of this card's Japanese name 「地中界」 (Chichūkai) is an homophone of 「地中海」, the Japanese name of the Mediterranean Sea, with the kanji for "world" replacing the one for "sea". This ties into the the Japanese names of the "Subterror Behemoths" being wordplays on parts and places of the latter.