Nizidramanii'yt

Nizidramanii'yt was a black dragon who allied with Jon Irenicus, attacking Suldanesselar and once there guarding the Goblet of Life to prevent anyone from following Irenicus to the Tree of Life.

The protagonist of Baldur's Gate II: Shadows of Amn must face Nizidramanii'yt and acquire the Goblet near the end of the game. Besides of fighting him, they can bargain for the Goblet, but the dragon will only give it for all of their treasure (gold and magic items), lying that he has no other treasure himself.