Myrthos, also known as The Sword of Power, is a unique melee weapon forged by the father of Hermosa and Kali. Its creator was a victim of patricide when Kali wanted the sword for herself, a move that was approved by Damian (see Folded Letter).

As an act of justice and revenge, Hermosa requests that you retrieve Myrthos in order to study it, and upgrade the Battle Tower's skill training arena, during the quest Murder for Myrthos (if she was chosen as skill trainer).