For monster damage calculation purposes, the baseline "0" defense is the typical for your level (add up defense from highest possible defense class items you can wear)
Then do atk^2/125 to get the max damage done to that player. If you have more defense, subtract 1/2 the increase. If you have less, add 1/2 the difference. It's more complicated than that but this would be within 100 of the actual amount.
Min damage is 95% of the max.
Then do atk^2/125 to get the max damage done to that player. If you have more defense, subtract 1/2 the increase. If you have less, add 1/2 the difference. It's more complicated than that but this would be within 100 of the actual amount.
Min damage is 95% of the max.