The Iron Thorn, otherwise known as the Cursed Ring of Slight Monsterism, is a rather odd ring that was added to Baldur's Gate: Enhanced Edition. This ring's primary fault would be a hit to Charisma, which is only significant to the leader of the protagonist's party. The secondary fault would be a unique change in appearance to a Zombie, which while some players might find amusing enough to make use of, also reduces movement speed to that of a zombie. It's also cursed, so it will require Remove Curse to remove it. Lastly, unlike most rings which are weightless, this ring weighs one pound.
This wrought-iron band is pitted and stained as if by acid. Between the two thorns formed by the band, a crude lump of silver on its head suggests the image of a skull against a black field, perhaps the symbol of Myrkul, Lord of Bones.