Thornmail should deal stacking true damage over time based on the user's maximum health
Why?
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Limit bruisers from abusing it but allowing Tanks to use it really well
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It dealing magic damage makes it deal less damage to everyone since everyone has MR
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It would deal less damage effectively if they attacked you 3 times but a lot more if they attacked you like 8 times
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Possibly have it give less armor than it does currently because this is a rather large buff