Slayer's Axe is a common weapon item introduced in the Total War: Warhammer II Resurgent Update and which is exclusive to the Dwarfs race as it can only be generated via their The Forge game mechanic (recipe: 30 oathgold ; can be forged multiple times ).
It provides minor armour-piercing weapon damage and bonus damage against infantry units buffs to its user.
In-game description[ | ]
They say a miner's pick can shatter anything it strikes! A grand claim, but one that has not yet proven false...