Staff of Thunder and Lightning

Staff of Lightning and Thunder is an enchanted quarter staff +2. It inflicts 1d6 +2 points of crushing damage and it has -2 THACO bonus. It weighs 4 lbs and the weapon has a speed factor of 4. The weapon has three abilities, thunderclap, Call Lightning and Lightning Bolt, the last two every similair to the spell. Thunderclap is a passive ability with a 10% chance upon every hit of the staff in melee to stun the target for two rounds if a save vs. spells. Call lightning deals 3d8 electrical damage for each strike. Lightning Bolt deals 10d6 points of electrical damage and it has a range of 140 ft and successfull saving throws half the damage dealt. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. It's not known where this item can be acquired.

In-game description
"Staff of Thunder and Lightning +2 There are stories that tell of these staves sprouting in the growth around druid groves when the forest is threatened. Fanciful tales, but truth or not, this staff is a powerful tool. It draws energy from storms, and there is a chance that any blow may trigger a thunderclap that knocks enemies down. It casts Lightning Bolt, and if circumstances warrant it, it can summon a lighting storm to blast enemies to dust. Some abilities are limited by charges."