I have not seen the perks on the chest piece so keep that in mind.
You say it has arc damage resistance. That would mean that is reduces all incoming arc damage which would mean you could wear it on any class and it would be very viable during an arc burn nightfall. Unless you only get the damage reduction when using an arc basses subclass?
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It's probably one of the two options, the other perk option probably requires an arc subclass
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I know that is true, but usually there is more than 1 burn on nightfalls, if there is burn damage it is well spread Out. unless it is the shadow thief which is mainly all arc.