Ring of the Ram

Breaker of the Castles, also known as the Ring of the Ram, is a magical ring which can be used to create a ram-shape billow, which does 5-30 points of damage to the enemy it hits. It can only be used once a day. This item appears in Baldur's Gate II: Shadows of Amn. It is not known where this item can be gained.

In-game description
"Ring of the Ram Also known as the Breaker of Castles, with one word this ring can unleash fantastic and deadly powers. When it is triggered, a barely discernible ram-like shape billows forth from the ring. This force can potentially knock opponents off of walls, destroy castle gates, or crush enemies, but it is damaging as well, in its own right."