Dracothraxus

Dracothraxus is a Dragon, and the final obstacle in the Test of Courage on the Isle of Fire in Ultima VII.

Dracothraxus had somehow managed to enter the submerged Isle of Fire, surprising Erethian and stole his Ether Gem. She seemed to know Arcadion by that time already, and stole the Gem mainly to annoy him, as he thought it to be his key to freedom. But fleeing into the Test of Courage made her part of the test, trapping her there.

The Avatar met her in Ultima VII, but killing her was futile, as the test had made her immortal, but as a reward, she gave the Ether Gem to the Avatar. She had no idea that he/she would use it to make The Black Sword. Returning with it, the Avatar used it to slay Dracothraxus with Arcadion's powers. But she was relieved that it was finally over, and her spirit free to roam again. She congratulated the Avatar on this success, then vanished into the void.