Dressad von Meir, hero of the Thousand Days of Battle, met an unfortunate end when he clutched the flail upside down. and without the benefit of gloves. The name has stuck ever since - much as the metal fused itself to Dressad's hands.
Ignore Shields, Wide Sweeps, Crowd Control
This is a DLC weapon!
You unlock it by purchasing the "Winds of Magic"-DLC and then completing the mission "Dark Omens" as Sienna. After completion on any difficulty, claim the recipe in Okri's Challenges and it will become available to craft in the crafting menu.