And level 28 heroic for that matter. I followed the instructions to a T and used my Ice Breaker (not level up at all) so that I didn't have to worry about ammo. I would imagine any sniper, preferably with Void would work as well, as long as you have special weapon synthesis. http://www.reddit.com/r/DestinyTheGame/comments/2j7eh6/how_to_solo_this_weeks_nightfall_devils_lair/