Nixa the Death Bringer is the 19th book in the series, where Tom travels to the forbbiden land. Nixa can disguise herself as a human girl,
With a voice that ‘’feels like daggers stabbed in your ears’’ which is potentially deadly.
She can be damaged by her main and most powerful weapon: loud and dreadful noises. This is proved when Tom grinds his sword against stalactites within the mine they fight in. The result of the continuous noise assault is Nixa’s body swelling and bloating before exploding into slimy chunks. However, once Tom defeats Nixa, the power of the golden leg protectors is taken away, to be given to Taladon, Tom's father.