M'Gama is a very powerful sorcerer known as the Geomancer, she is a friend of the Queen. When Cara first sets off on her quest to return to earth and bring her grandmother back to Luster, she first stops at the cave of the Geomancer. M'Gama uses a create deal of energy in locating the gate Cara needs to take to return to earth. M'Gama tells them that the gate is in the territory of Ebilan. Before sending Cara on her journey, M'Gama bathes her and gives her clothes. She also feeds Cara and her friends then gives Cara a sword to protect herself, and a green ring that glows whenever Cara hears "The Song of the Wanderer."
Later in the book it is revealed that M'Gama was the one who preformed the spell that turned the unicorn Flickerfoot into a human. That human of course was Ivy Morris. In the end, it is M'Gama who breaks the Queen's horn, which causes Ivy Morris to turn back into her true form of the unicorn Flickerfoot.