Could someone please explain this to me. I was under the impression that the attack roll plays out as follows. THAC0 of attacker minus the AC of attackee. The attacker must then roll that number or higher on a 20 sided die to inflict damage. That makes sense. But what about when the AC goes below zero? Then you wind up adding the two number instead of subtracting. Does this make sense? If so, how?
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