E.S. Reuben is the E.S. of Jin Uzuki, manufactured by Vector Industries. Reuben appears for the first time in Xenosaga: A Missing Year, as an E.S. under the jurisdiction of the S.O.C.E. that is loaned to Jin by Juli Mizrahi. It is customized for Jin's use. Specially made for close-range combat, it is equipped with two real swords. Its design emphasizes higher-dimensional battle mobility; as a result, its armor is light and it has no shield equipment. However, this is covered by Jin's unique battle style, which combines offense and defense using his swords.