Another assumption I started with, is that a basic melee or ranged attack on an AC 10 opponent requires a minimum total attack roll (ie. d20 + base attack bonus without the strength, dexterity, or any other modifiers) of 10 in order to hit.
Similarly, a basic attack on a
3E/
4E AC 15 opponent requires a minimum total attack roll of 15 to hit. (ad nauseum)
The conversion between the AC's is:
3E/
4E AC = 20 - 1E AC
What was surprising was the -1 base attack bonus for the lower level magic user/illusionist and thief/assassin, under this assumption. Without their abilities and powers, these classes are functionally not much different than a regular human or a "minion" in
3E/
4E.
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