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Ironheart SP1 Vulnerability Reducing Damage Instead of Increasing It

Simply as described in the title. Her basic hits and damage over time debuffs do about a third less damage after using her SP1 than they do without the Vulnerability passive applied.
1
Comments
Light : 1181
Medium: 1915
Incinerates: 98
With Vulnerability
Light : 875
Medium : 1404
Incinerates: 67