The Emerald is ESIT's power supply. The Emerald has as more power than 4 rocket-ships. (A.K.A. this emerald is a nice power-supply)
The Emerald was first found in a desert deep in the sand. It caused a desaster when a group of 4 ESIT troops took it out. It caused a sand-storm, a tornado, and some how it rained sand. All of the troops quickly got out of the desert and when the storm was over they went back and brought it to their home-base as a power-supply.