New Formulas Simplified

Mirror image is what's making the calculations exact and not just an approximation so yeah, must be a dual blader, reason being that mirror image tells exactly which random number from your damage range that the critical damage picks and modifies.

Wow, that's pretty handy. If the SE/thorns thing doesn't work out, you could test crit on the marauder through lucky dice. When i was playing earlier i mostly got 2s and 5s, but 2 and 3 modify crit chance and damage so just wait for those buffs.