Armor of Vulnerability (Piercing)

Heavy armor (plate armor), cursed item, major, rare (requires attunement)

• Armor Class: 18
• Properties: Cursed
• Strength: Requires 15 STR.
• Stealth: The wearer has disadvantage on Stealth (DEX) checks.
• Weight: 65.0 lbs.

While wearing this armor, you have resistance to piercing damage.

Curse

This armor is cursed, a fact that is revealed only when an identify spell is cast on the armor or you attune to it. Attuning to the armor curses you until you are targeted by the remove curse spell or similar magic; removing the armor fails to end the curse. While cursed you have vulnerability to bludgeoning and slashing damage.

Source: Dungeon Master’s Guide p. 152. Available in the SRD