|From Journey to the Center of|
the Earth by Edouard Riou
Any fantasy world worthy of the label is practically hollowed out by a network of caverns, tunnels, and subterranean grottoes that would make terrestrial cavers wet themselves. Regardless of what it’s called—Underdark, Khyber, Svartalfheim, or just “the underworld”—a journey through that landscape must be a different sort of undertaking from walking or riding between Riverdale and Midvale. Players should never be able to forget that their characters are moving through a dark, alien landscape.
(Read the rest at Kobold Quarterly ...)