Osther, introspective and driven by an insatiable curiosity, possesses a quiet determination, unafraid to delve into dark and unknown territories to uncover the truth of her death. Once the daughter of a noble, Osther died under mysterious circumstances. When revived through unknown forces, she found herself alone in her casket, abandoned in an old deteriorating church. Osther was then drawn to Thanatos, sensing in her a kindred spirit who understood the complexities of life and death. This bond led Osther to side with Thanatos, seeking answers and purpose in their shared quest for truth and vengeance.