Was ridiculously easy to solo. 1 shot each on the 3 Phalanx commanders. 8 shots to kill the tank, 2 on each thruster. 6 rockets to kill Valus. Patience and Time was doing 10k+ a shot thanks to the Arc Burn, and my Unfriendly Giant with Arc damage and cluster bombs destroyed the final boss. Playing as a Hunter, the Arcbolt grenades took out pretty much anything else that got in the way, and being able to cloak let me move around to position myself for clean shots without having to worry about any trash mobs.