[1.2.318] Maplestory 2.0

 Look at the damage range

STR = 210
DEX = 46
WATK = 90
Using 1H Sword

MaxDmg = (STR * 4.0 + DEX) * WATK / 100
MaxDmg = (210 * 4.0 + 46) * 90 / 100
MaxDmg = 797

Looks like the max damage calculation still holds. The minimum doesn't.

MinDmg = (STR * 4.0 * 0.9 * Mastery + DEX) * WATK / 100
MinDmg = (210 * 4.0 * 0.9 * 50% + 46) * 90 / 100
MinDmg = 381

The minimum seems to be almost exactly 70% of the max. Maybe mastery is +50% mastery on top of a 20% base, with mastery meaning what percent of the maximum the minimum is? That would explain evan's (or some other class, I'm forgetting) mastery not being able to go beyond 70%.