Sekamina: Middle level of the Darklands, characterized by seemingly unending caverns and tunnels that can span continents.
Serpentfolk: Ancient race of reptilian humanoids with heads and tails like snakes, which once claimed a vast empire but is currently in decline, with most of the individuals left slumbering in underground chambers.
Seugathi: Subterranean race of intelligent, tentacle worms with magical powers.
Song of the Spheres: Desna
Sorcerer: Someone who casts spells through natural ability rather than faith or study.
Tolguth: Settlement in a region where the cold tundra of the Realm of the Mammoth Lords is warmed by geothermal activity, resulting in strangely lush valleys filled with prehistoric beasts.
Tusk Mountains: Mountain range that acts as the northern border for the Realm of the Mammoth Lords.
Varisia: Frontier region at the northwestern edge of the Inner Sea region.
Vaults of Orv: Enormous and ancient subterranean caverns, often with their own unique ecosystems, found in the deepest reaches of the Darklands.
Wizard: Someone who casts magical spells through research of arcane secrets and the constant study of spells, which he or she records in a spellbook.
Worldwound: Constantly expanding region overrun by demons a century ago.
Wraith: Formless undead creature born of evil and darkness, which hates light and living things.
Xulgaths: Intelligent and evil reptilian humanoids that dwell in caves. One of the oldest intelligent races, long since outstripped by other races, and now viewed as feral savages.