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Item Type: Armor
Item Rarity: Uncommon
Requires Attunement: No
D&D Beyond: Mithral Armor
Source: Player's Handbook
Mithral is a light, flexible metal. A mithral chain shirt or breastplate can be worn under normal clothes. If the armor normally imposes disadvantage on Dexterity (Stealth) checks or has a Strength requirement, the mithral version of the armor doesn’t.