Hydaelyn

Abandoned once purged of ore, Copperbell Mines lay untouched for nigh on three centuries until Amajina & Sons Mineral Concern reclaimed the shafts—the guild's sights set on expanding the mines downward in an attempt to tap yet undiscovered veins of valuable metal. Unfortunately, it was not riches the powder kegs uncovered, but sheer terror, for when the smoke cleared, out poured an army of raging giants from the darkest recesses of the mines. The hecatoncheires—thralls of the lost Thorne Dynasty—were, at last, free from their lightless prison, three hundred years of hate fueling their madness.

Dark, rugged tunnels with scattered mining equipment, old wooden supports, and faint glimmers of ore veins in the walls.