Corrosive Blade

 is an uncommon weapon item in Total War: Warhammer II which enables poison attacks and grants a major armour-piercing weapon damage bonus to its user. It is unique to the Skaven.

In-game description
"This weapon weeps a corrosive venom that can melt through armour to help deliver the poisoned point."

Trivia
Curiously, this item is labelled "weeping_blade" in the game files.