As the seasonal mod for Unstoppable is Scout Rifles, Malice will not activate once applied in the primary slot, also will not proc in-game. This has been a thing for months, don't know how no one has noticed it
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Exotics that have intrinsic anti-champ does not change behaviour when the weapon class is also anti-champ. You still have to use the weapons special anti-mod mechanism for it to trigger. Otherwise some exotics would be double anti-champ in some seasons.