The adventure "Postmodern Prometheus" on Io has an encounter at the end that spawns orbs of light and basically gives you infinite super energy. Unfortunately, there's no Darkness Zone, so you can't just nuke yourself to restart the checkpoint, but there's very little setup for the adventure, so it's pretty easy to repeat. In the final encounter, the Vex won't spawn unless you kill all the Blights, so leave them up as long as possible. If you do take them all out, kill the Vex, and leave the two Cyclops alive (since they're pretty hard to accidentally kill). Once all the other Vex are dead, kill the Cyclops, and abandon the activity. Also make sure to save your super for the first part of the encounter where you have to defend the area. Group up all the taken thrall and nuke them. I was getting 30-40% a run. I know you can farm the first wave of EP or the infinite thrall in the Whisper mission, but I think this is easier and more consistent than the EP method and possibly faster than the Whisper method (it's also available all week, unlike the Whisper method.)