When fighting waves of enemies in the portals that spawn periodically around Glenfort, you have a chance to obtain flux. There are three different colors of flux that correspond to the type of portal you are fighting in. The chance to receive flux of a matching type to the portal you are in is much higher than the chance to receive flux of another color. As you fight enemies the phase meter will also build up and you will move to phase 2, 3, etc. As you move to higher phases, your essence drops will be increased.