Scoundrels/Operatives have Acid Blade/Fletchette round which gives a -50% armour debuff however I think their ranged counterparts can get something similar (not played Gunslinger/Sniper so can't say for certain). Oh and that's being nerfed for being too OP in PvP, reduced to -30%...joy...

Now for Red Reaper final boss, you may or may not already know this (if the encounter is genuinely bugged then I apologise) but that is kind of how the encounter is designed. Basically the final boss AND both the adds do not take damage when he goes into that phase. The adds shield will take damage but the mob themselves will not. When the boss goes into his invulnerable shield phase you basically need to run to one of the adds, DPS down their shield and then put the Add between yourself and the boss when he uses Force lightning. The Force Lightning will then kill the add if it hits for pretty much the full duration with the add not having a shield. This is the only way to kill the adds. Focus on one add and then the other and then go back to the boss. I'm not entirely sure what the 'summoning fire phase' actually does, I'm assuming your probably suppose to drag him through it but we just ignored it and continued attacking the boss since the Fire did nothing, so I am curious about that.

Everyone forgets about the poor scrapper spec Smuggler. we get: 1) CC that requires Out of Combat condition (rare in all but the capture the point PvP match) to work and breaks on damage. 2) an 8 second AoE CC on a 90 second timer that breaks on damage. 3) a 4 second stun that roots us to use. As far as I can tell (at level 38) we have no knockback abilities. The only thing going for the class is the high burst coming out of Stealth (flechette round, shoot first and, with the target knocked down, Back Blast and possibly quick shot which requires being level 40 before getting that combo) and the fact every 2 minutes (3 if not specced into it) we can make an emergency restealth getaway. So you want to complain about the Marauder go ahead but you can take my restealthing in combat away out of my cold dead hands.