I've gotten stuff like this before. It almost always came up when I cast some detrimental spell on a mob, like one that lowers one of their stats or something. Not all spells did it, but certain spells did this all the time. I just cast them and every hit I did while it was in effect was for 1 dmg or a miss. So I jsut stopped casting those spells and it hasn't come up for me again.
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