Judith is one of the elite warriors of Terra - one of the Furies. Furies are artificially created super soldiers. All of them are female, by the way. Furies wear special Fury armour designed especially for them and use a wide variety of ranged and melee weapons. They are also much stronger than any human, have some psychic powers and natural resistance against magic. Originally Furies were used to drive the Altlings that have taken over many planets of the Federation away, but now they take part in many major conflicts.
Most of the Furies are rather calm and even-tempered, but Judith seems to have that sinister smirk on her face most of the time. She is one of the deadliest Furies of her generation, and on the battlefield she turns into a bloodstained whirlwind of steel and fire, tearing through the enemy ranks with the ferocity of a Hell Knight. Even the soldiers of the Federation fear her, as nobody knows what thoughts and desires lurk behind her green eyes..