From the Battle Guide.
So you'll see above it says you consider your opponent's damage stat and the value of the dice roll. This is not to say that you need to add numbers or do percentages or anything like that, but consider that although a bruise (damage roll 1) is still a bruise, it can hurt more depending on who gave it to you.
ex.
If a 5 year old girl punches you, you arm is bruised, and it kinda hurts, like a damage roll of 1.
If a buff marine soldier punches you, you arm is bruised, and it really hurts. Just because he's a soldier doesn't mean you arm suddenly pops off, but the bruising will probably be more extensive, deeper, wider, more immediately tender. Still a damage roll of 1, still a bruise, but more damaging.
If a 5 year old girl hits you with a crowbar, your arm is maybe dislocated or utterly unusable, a damage roll of 6.
If a buff marine soldier hits you with a crowbar, your arm is probably broken, a damage roll of 6.
Does that make sense? The dice roll of 1-6 is always to keep the damage scaled, but the extent of that damage does vary with your opponent's damage stat, hence why greater damage stat means more HP is lost.
Helovia Hard Mode