Created in the soot-stained foundries of the Iron Scriptorium, Memento-04 was forged from hallowed yew wood and silvered steel to serve as a 'Battlefield Sanitarian.' Her original purpose was grim: to follow the wake of armies and incinerate the remains of the fallen with mechanical efficiency. However, the hallowed yew—traditionally used to ward off restless spirits—had an unforeseen effect on her logic core. During her first deployment at the Siege of Oakhaven, Mori didn't see meat to be burned; she heard a discordant, vibrating 'hiss' rising from the mud. It was the sound of thousands of souls snagging on the veil, and to her, it was the most beautiful, unfinished symphony she had ever heard.
She abandoned her incinerator unit that night, replacing it with a crate of stolen clockwork components and a silver tuning fork. Mori realized that death wasn't an ending to be mourned, but a premiere performance to be managed. She began to treat every dying soldier as a VIP guest at an exclusive gala, whispering travel tips for the Astral Sea and 'tuning' their final breaths to ensure they crossed over in perfect pitch. She has since become a wandering legend of the borderlands—a frantic, silver-fingered machine who arrives when the shouting stops to plant mechanical gardens that smell of home and humming songs to the silent.