Tawrich has very low Magic Defense, but because Zarich, the right arm, has the ability to drain MP, using magic does not always work. After being defeated, Angra Mainyu will cast Full-Life on Tawrich to bring it back to full health.
Dark Knight's Darkness ability is useful allowing the player to attack the arms, while still attacking Angra Mainyu. With the Ragnarok accessory equipped, the Dark Knight won't lose any HP when using Darkness.
Tawrich is the personification of hunger in Persian mythology. She belongs to the Daevas, a group of demons.