Easy: material farming in a pocket universe running out of a Vex simulation somewhere. In that pocket universe, the Guardians are Vex. This is the remains of a patrol mission - [i]Collect Human Scientist Limbs. [/i]Each pair equals 3.14% Their Everywhen War Cult is conspiring with their Forever Monarchy to construct a Vex King, and they need materials from across time and space. Just keep it on the down low, please. Things with ontological value can be useful. A few million parts human handiwork and strong foundation can make for a strong leader. Often hunted for by young Vex Guardians leveling up their Ascendant Light level, or material farming.