Located in the southern part of Hephake, Derivlia Lake has become severely poisoned by runoff from the silver mines of Phorysia. The water is toxic, killing most life and leaving the shores barren. The lake serves as a stark reminder of the environmental cost of Hephake's mining wealth, and the dwarves have made no efforts to clean it—silver production continues unabated, and the poison flows into the lake year after year.