The description of the underground city in "The Serpent's Shadow" would likely be extensive if detailed by Carter, focusing on precise measurements, historical context of the sculptures, and the origins of the House of Life's magical headquarters. However, the essence of this place can be captured succinctly.
It is a vast and enchanted space situated underground, filled with supernatural elements. This straightforward summary captures the city’s grandeur and intrigue without getting lost in overwhelming specifics.