Anyone want to take a shot at explaining this rather questionable Rooting Pain damage?

[Dr.KennethNoisewater]

[Xaratas]

55.8 damage is not that bad for one attack. Booth got reduced to minimum Damage, which is 23 Damage more than without that cushion. So, where is your question?

[Dr.KennethNoisewater]

Sorry should have added an explanation with the pic.

It lists the final (MIN) damage as higher than my initial pre DR output.

I though minimized damage from high DR was equal to 20% of base so I don't get how a 5 damage graze and a 12 hit both equaled out to the same ~12 damage after 11 DR. At the very least shouldn't the hit and graze have a more obvious difference in damage after being minimized?