This suit of armor is reinforced with adamantine, one of the hardest substances in existence. While you're wearing it, any critical hit against you becomes a normal hit.
Adamantine Armor in the 2024 rules
The 2024 Dungeon Master’s Guide revised the magic items, and the SRD 5.2 carries the new text. What changed:
Same rarity and attunement.
Type
Armor (Any Medium or Heavy, Except Hide Armor)
Rarity
Uncommon
Attunement
Not required
This suit of armor is reinforced with adamantine, one of the hardest substances in existence. While you're wearing it, any Critical Hit against you becomes a normal hit.
