Lady Knight's "great big sword," a two-handed sword similar to a Scottish claymore (though Lady can briefly wield him one-handed). Lady acquired and named her magical weapon while she acted as a mercenary in elven lands. She refers to Moneymaker with masculine pronouns (such as "He's being petulant today," which her accent renders "'E's bein' pet-chu-lent t'day") and believes he has his own personality. They don't always get along, either.
Moneymaker resists magic, including, but not limited to, every illusion Lady has tried to place on it. In battle, he deflects all offensive spells cast on him and his wielder, and returns the attack to the caster. On the rare occasions Lady gets angry with him and tries to leave him behind, he somehow keeps appearing near her until she accepts his presence.
Nobody ever stole Moneymaker for long. He always, always came back to her—even if she didn't want him to.
Lady swears the sword speaks with a male voice. She is the only one who has ever heard this voice.
Hrm.
Legend
Legends tell of the Sword of Mammon, which curses its bearer with insurmountable greed. If discarded, the blade always finds its way back to its owner. It will torment its carrier as long as they live, and after their death, it will do the same to the next person to claim it. In this way, the wicked blade has passed through many hands.
Reality
Moneymaker is the source of Lady's Dreamwidth account name: moneymakershaker. (Ree thought it was hilarious.)