This has to be a bug. Zero guard resistance is not what it was last season, but beyond that it means you effectively cannot guard because it has zero damage resistance.
The same happened with Burst Guard, but in reverse. 100 Guard Resistance, but zero endurance. What the heck?
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I remember reading a tweet by DMG (I think) and it said that the stat "changes" are only to reflect each archetypes strengths and weaknesses. I guess to show more variation. It said they didn't have any numbers actually change in gameplay.