Dwarven Excavation (d20)
The Dwarven Excavation is an underground mining complex. It features tunnels and galleries dug for the sole purpose of extracting precious minerals¸ such as gold¸ silver¸ mithril and copper. But¸ often¸ the dwarves dig a tunnel they shouldn't have dug¸ waking sleeping monsters¸ invading hostile territories and so on.