The Dangers of Black Magic — Elizabeth A. Reeves

The whole world is at stake. Sundala is a magical land populated by the Eight Races: Man, Elves, Imps, Dragons, Karduul, Hagri, and Isliji. For eight hundred years they have lived in separation, but now they must draw together as one to unite against a common enemy or face complete and utter destruction. Kyraen Aduli, slave in Sorcerer Balin's house, knows little of what is happening in the land, until he sends her with an odd companionship to seek for the last hope that Sundala has... the Black Diamond of Akhura. No one knows if the Black Diamond is truth or fable, but one thing is very clear-- if the creatures of Sundala are to survive, they must find it-- at any cost!