Mithral Form (5e Feat)
From D&D Wiki
Your body is steeped in the magic that created it, capable of transmuting material inside it into pure mithral. So powerful is this magic that even organic material, such as leather, can be transmuted. Any armor you don (not including shields) gains the properties of mithral armor until you doff it, and so close is your bond to mithral that you can wear it like a second skin. You gain the following benefits when you don any armor (but not shields).
- The armor does not impose disadvantage on Dexterity (Stealth) checks, even if it normally would, and has no Strength requirement, even if it normally would.
- The armor counts as magical and metal, even if it normally would not.
- If the armor was made of a metal which is not mithral, it weighs half as much as it used to.
- If the armor was already made of mithral and you lack proficiency in it, you are considered proficient in it. If it was already made of mithral but you are proficient in it without the use of this feat, you gain an additional benefit based on its type:
- Medium: The maximum Dexterity modifier you can add to your AC while wearing this armor increases by 1.
- Heavy: Bludgeoning, piercing, and slashing damage that you take from non-magical sources is reduced by 3.