You literally HAVE to use Arc against him to get his shield down. Nothing else works. I thought he was impossible to kill to begin with, it's just he's immune to void, solar and kinetic damage.
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I emptied 25 sniper bullets from P&T maxed out and his shield does not move.
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I did it during the "enemies have begun moving against one another" scene, there was so much bloodshed
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Well done you, we tried it for three hours and were unable to even depletes his shield; let alone injure or kill him. He was easy enough to kill during the defend the warsat public event.
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Well done you, I did in like 30 minutes