Caverns is region IV of Valor Mortis, a former salt mine that the plague has partly taken over. When war broke out, many people went underground here for shelter, and few of them ever came back out. Main quest chapter 4, DARK DESCENT, opens in this region.
Lanterns stand at Last Sunlight, Weeping Ledge, Old Mine, Mine Cart Route and Ancient Lair. The Sphinx and the Devourer of the Unworthy are the bosses fought here. Look for the Ambers Dominatus, Limit Break, Lucky Shot, Lunatic's Grasp, Perfectionism and Surplus. The map holds 11 chests and 4 notes, and the Mining Shaft Key is picked up in Caverns. An altar here rewards Stasis Transmutation. Expect Risen Soldiers, Musketeers, Grenadiers, Lancers, Duellists and Sapeurs, along with Carrion, Spewers, Howlers, Volunteers, Shambling Civilians and the Eternal Guardsman.
Last Sunlight
Weeping Ledge
Old Mine
Mine Cart Route
Ancient Lair
Sphinx, Devourer of the Unworthy
Perfectionism
Dominatus
Surplus
Limit Break
Lucky Shot
Lunatic's Grasp
Stasis Transmutation
Pistol Ammunition