Mould: Northern Vengeance Valheim 1.0.20
Mould: Northern Vengeance is a material found in the Deep North biome in Valheim. It is used to craft Cast: Northern Vengeance.
“Filled with the right material, this mould will create a powerful magical item.”
Mould: Northern Vengeance is a material. Its in-game description reads: "Filled with the right material, this mould will create a powerful magical item." It weighs 1 and stacks up to 10 per slot. It can be teleported, so you can carry it through a portal along with your other gear.
The only use listed for it is crafting Cast: Northern Vengeance. It has no effects of its own.
Used to craft
Other material items
Acorns, 
Amber, 
Amber Pearl, 
Ancient Bark, 
Ancient Coin, 
Ancient Metal, 
Ashlands Gourmet Bowl, 
Ashwood, 
Asksvin Bladder, 
Asksvin Hide, 
Asksvin Neck, 
Asksvin Pelvis.