Re: Infernal Sword
Pen bonus (e.g. inches) increase chances of penetrating enemy MR.
The standard MR checks at 12, so when you banish an undead who has MR 14, you are doing so at -2 MR check on the DRN table, looking at the manual that has a 30% chances of hurting the undead. With +1 inches you are effectively doing -1 MR check rather then -2, or 38% on the DRN table. This is why mind hunters want +5 inches.
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