Just as the title said. Iron Banner gear should go for glimmer not marks.
Edit 1: Keep in mind IB has also, for the last year, had end game light levels. will these be in the RNG drops.
Edit 2: So when looking in the armory the gear is set at 280 for IB. if we are 290+, why grind. I may be miss adventuring. And i may not run the IB. Sorry for the post now.
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Hope iron banner rewards a ton of marks then. Something like 25 per rank would be sufficient.