Raiders of the Lost Tomb
Reportedly once the most productive dwarven mine in the country, with vast stockpiles of emeralds and diamonds. The dwarves knew of this reputation and prepared a suitable welcome for would-be raiders. Ballistae of every sort lined the entrance. The clan leader, a hateful old dwarf named Kyer Wyrmheart, kept pet dimetrodons, which feast upon anyone caught trying to enter the mine. None of this was enough to repel the dragon which now lives there with the treasure of the dwarves (and their bones).