I'm at the end of my rope. No matter what I do to reconfigure my artifact, I cannot get the mods to apply. I haven't been able to do ANY endgame content without incredible suffering for almost 2 weeks. I can't stun champions, I don't receive my extra firebolt grenade, and none of my void abilities are showing up. I've spent over 500 hours and hundreds of dollars playing this game in the last 6 months and I'm about to yeet it off my ps5 for good.
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Check your helmet mods . I’m running into the same issue , can’t stun champs if I’m using any helmet mods other than the first slot.