Dragon Eggs

Dragon Eggs is an item needed in chapter 5 of Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. They have been stolen by Jon Irenicus from Adalon to secure a deal with the drows of Ust Natha. Adalon enhances the party of Gorion's Ward with a magical disguise which makes them look like drows. If the player character returns the stolen eggs to Adalon, they will receive Necaradan's Crossbow.

In-game description
"These are the eggs of the silver dragon, Adalon. They were stolen by the drow for some evil purpose."