This weapon needs to be hardened with frost.
Full material breakdown in the crafting calculator →
20 Bloodgold + 1 Mould: Nord Sledge + 10 Timberwood → 1 Cast: Nord Sledge
Unlocks once you have stood near a Black Forge of level 4 and picked up each of: Bloodgold, Mould: Nord Sledge, Timberwood.
