Resistance mods benefits are so low that you can barely even tell the difference.
Even when you have 3 of the same mod, you still take about the same damage.
You might survive with 1hp from what would normally kill you.
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I use stacks on stacks and 2 resist mods unless it's deadly threat, then I stack 2 and 1. Maybe a buff to the affinities but increase the cost by 1? 😇👍💠