what's the difference from damage roll and injury?

C3 = Confrontation 3
Confrontation is the board game / tabletop game on which DoWO is based off.

In confrontation it was a good tactic to field some morbid puppets with martyr who acted as mana-reserve for your caster and even could shield him from enemy troops. Those puppets were then targeted by a STR 6 die roll vs TOU 0 - which usually ended in death or at least some wounds.

In DoWO you make a STR 6 roll vs any initial toughness of the targeted unit + hard boiled (in case of pimped skeleton warriors) - which results in a far less dramatic development of things.

+1
thx