Adalon

Adalon was a silver dragon who attempted to keep peace between the Drow and the surface elves by guarding the passageway between the surface and the Underdark, often being successful.

In Baldur's Gate II, Adalon will ask the player to retrieve her eggs after they were stolen by Jon Irenicus. She will ask for the player to infiltrate the drow city of Ust Natha and steal back her eggs disguised as Drow. By doing this, the player will be able to return to the surface, able to first defeat Bodhi and later Irenicus.