Everything is pretty obvious other than
NPCACFactor which is how much npc base ac gets divided by. Ex 2.25 npc ac = 1 player ac.
The thac rules are poorly named cause they used to do something else and I never changed them but they have to do with how big a factor attack and ac plays when there are successful mitigation and attack rolls. The higher the number the less possible range there are on reductions and increases from those rolls.
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