Dude, solo the Nightfall. If you've got an Icebreaker and decent map knowledge it's dead easy. You'll be done in 15-20 minutes tops. Very fast strike. If you use the clifftop cheese spot, just run past the Axis Minotaur back to the rear entrance to the cave (near where the Minotaur spawns). The Minotaur will run up to the lip of the cliff face and stand there waiting for you to try and come back. Snipe him to death, then go back to shooting Sekrion. Rinse, repeat. You can do it in your sleep. If you use Sunsinger, you can also kill that Axis Minotaur with Fusions rather than having to waste Icebreaker rounds on him.

System?