Dornen is a stout Duergar with ash-gray skin and a thick black beard often dusted with soot. He wears heavily reinforced scale mail that looks like it was scavenged from an iron golem, and his hands are permanently stained with grease and oil.

Grumpy, practical, and intensely focused on the job. He doesn't care much for conversation unless it involves the structural integrity of his carriage or the precise torque of a bolt. He values loyalty and efficiency above all else.

Dornen was a master forge-hand in an Underdark citadel until an Illithid hive-fleet reduced his home to ruins. Enslaved for a time, he spent years forced to maintain the biological and mechanical horrors of his masters. He finally escaped during a chaotic containment breach, fleeing to the surface with the knowledge of how to bind soul to iron. He found a new home among the Iron Oaths, a thieves guild that recognized his genius. Known as the Wrench, he built the Lockbox, a heavily armored getaway carriage driven by his loyal construct Otto. He keeps the gang mobile, ensuring they can escape any scrape as long as his wheels keep turning.