Draconis

Draconis was Abazigal's son and like him he was a dragon which could take the form of a human. Unlike Abazigal though, Draconis was a brown dragon, whereas Abazigal was a blue dragon. Whilst he was in human form, he was a mage.

Throne of Bhaal
In Baldur's Gate II: Throne of Bhaal, Draconis is outside the entrace of Abazigal's Lair. The player needs to kill Draconis and take his head to gain entrance to the lair.