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A lot of whining happened with the new Demon Marks being introduced about passive applications, despite the very superior passives possessed by others not mentioned here. So it got nerfed to the point you're seeing in your testing. Log it and make a report with said log to prove the inviability, will make it easier to fix.
Xenthos said:When did they get "nerfed"? I do not recall that. There was a lot of discussion about the stacking potential.