Hammer of Thunderbolts is an enchanted war hammer +3. It requires 18 strength to be wielded. It is able to inflict 2D4 +3 points of damage and has +3 bonus to THAC0 and speed factor. This item appears Baldur's Gate II: Shadows of Amn. The hammer can be found in the Mind Flayer's Lair, which can be accessed from Sewers (Temple District) with the Sewer Key. This item can be upgraded for 10,000 into Crom Faeyr when talking to Cromwell. It also requires the Gauntlets of Ogre Power, Girdle of Frost Giant Strength and Crom Faeyr scroll.
|“|| Hammer of Thunderbolts: A dwarven smith, Silverblade, forged this hammer and two other items; a girdle of giant strength and gauntlets of ogre power. His intention was to gift them to his son, who was then a high officer in the dwarven armies, fighting the giant and ogre tribes of the area. Unfortunately Silverblade's son died just after the completion of the three items and before they could be gifted to him. In grief Silverblade himself donned the girdle and the gauntlets. Taking up the Hammer of Thunderbolts he went to battle against the giant folk. He died valiantly.|
Alone, the Hammer of Thunderbolts is a powerful magical weapon but when merged with the gauntlets of ogre power and a girdle of giant strength the hammer is transformed. This transformation requires magical assistance. The Hammer of Thunderbolts is then capable of doing an additional +8 damage as well as instantly killing any giant or ogre that it strikes.