"Oh, what a mess!"
This article is in serious need of improvement. Your help would be graciously appreciated.
The Caldera is the interior of the dormant volcano near the Cleft. Bahro have drawn the story of Atrus and Yeesha's family on the stones here. The Moiety dagger that was next to the link-in chamber on the Age of Riven fell through the Star Fissure when the Age collapsed and now rests in the centre of the caldera. One of the entrances to Descent can also be accessed here through a ladder in a small hole.