D&D 3.0: Tales from Mystara
Located on Safari Island of Ierendi is the crater of an extinct volcano that currently has a marsh inside of it. Is located south of Mount Boanga. The place has been conditioned to be used as an arena by visitors. The crater rim and the central rock inside the crater are the basic elements. The crater itself can be either flooded with water, drained with streams running from the island to the rim, or kept absolutely dry.
The middle rock has three levels with caves that are stocked with monsters. The keepers herd
Hill Giants and Trolls from the Tikka Mountains to prepare the crater for visitors but other monsters are also prepared like Black Puddings, Gelatinous Cubes, Gray Ooze. ( Ooze ) .