Boon of Rust (5e Epic Boon)
From D&D Wiki
Boon of Rust[edit]
When you hit an enemy that is wearing medium or heavy armor with two successful melee weapon attacks, their armor Armor Class is reduced by 1. If you reduce their Armor Class to 10 their armor breaks and is no longer usable. If you land a critical hit, the Armor Class decreases by an additional 1.
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