The Duergar Vol 1

Deep into the Underdark,the duergar have made a life for their own.
Blazing furnaces and forges light up the giant cave systems where the dwarves are farming and smelting ores tirelessly day and night,for many years the dueregar have been using the dragon Themberchaud to help them light up their giant forges while satisfying his endless hunger.
Using giant cave spiders known as steeders they carry cargo crates with ores,weapons and other goods across the underdark making trades.
Their style in crafting was never about beauty but rather usefulness so their constructions were simple but efficient.