Ring of Spell Turning

Ring of Spell Turning can be used once per day to cast Minor Spell Turning. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. It's not known where it can be acquired.

In-game description
"Ring of Spell Turning A gift to Derek Poodon, apprentice warrior, this ring was his salvation when he stumbled upon two Red Wizards traveling the Cloakwood Forest. Enraged at being disturbed, the mages unleashed a score of Magic Missiles at the seemingly helpless Derek, but to their brief surprise, the assault reflected back and killed them both.  Thereafter, without having lifted his blade, Derek was rather sheepishly known as Derek the Red Slayer."