Mammet-19 Epsilon is a Notorious Monster from Final Fantasy XI: Chains of Promathia. Three of them are encountered as part of Promathia Mission 2-5: Ancient Vows.

Like all mammets, Mammet-19 Epsilon can switch weapons in combat, which changes the abilities at their disposal and their attack speed. "Spear Form" uses slow, hard hitting attacks, "Sword Form" attacks extremely fast, and "Hand Form" strikes a balance between the two. "Staff Form" grants it access to area of effect -ga level spells. It is possible to prevent them from changing their weapon by using the Yellow Liquid item on them, which itself is dropped by mammets. XI