User blog comment:Neppudere/Time to lay down the LAW: Legendary Archwitch Guide/@comment-13020706-20150925102211/@comment-26896603-20150926025711

CritDMG is calculated differently from regular abilities, if you ask me - I haven't tried it myself since I have no aspirations to be a 1BP LAW hero. From what I heard, there have been people who managed to 1BP it using crit abilities from the JP community - but this is unconfirmed.

CritDMG is multiplying your damage by *2 before DEF is factored into the algorithm CMIIW - if the cap is @ 3.2M, then hitting for ~6M is considered normal and possible.