Necaradan's Crossbow

Necaradan's Crossbow is an enchanted light crossbow +3 which has +3 bonus to damage and -3 to THAC0. The weapon weighs 5 lbs and has a speed factor of 2. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. It can be acquired as a reward in chapter 5 when you return the Dragon Eggs to Adalon.

In-game description
"Necaradan's Crossbow +3 Bower Necaradan crafted this masterpiece almost thirty years ago, lacing strong enchantments within both the wood and the string. It is said he only fired it once, just to see if it performed as true as he had hoped. He was reportedly not disappointed, but a local nobleman sought the bow soon after, and it eventually fell into the hands of bandits."