(Titan Main) Yes they do. Just did a Master Lost Sector and was using Chaos Reach. Felt UTTERLY USELESS. Like a feather vs a rock. If I recall correctly, Choas Reach is supposed to be the Arclock Boss Killer and it sure as heck didn’t feel like it. Granted I was under level for Master Lost Sector (LS was 1600 and I was 1575) and not “properly equipped”, but it shouldn’t take 3+ super activations to kill a LS Boss.