I bet the guy who wrote it has not even played Destiny end game content if he is talking about Arc resistant bosses. He clearly does not know how the elemental system in the game works; he also does not know that bosses do not have elemental shields in this game.
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The post is from august. So no, he obviously had not played Destiny's endgame content.
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A Praetorian with a purple shield is susceptible to void damage and resistant to arc, solar, and kinetic damage. So what he said was completely valid.