The best I have been able to do in Baal/Cerb is to put Calvin in the 4th position with a level 4 Partisan. This delays the big strike until there is only one of my heroes left. Note that if you upgrade the rune to level 5 then he hits too early and you will loose one round on the fight.
this is 100%...there is also a lot more that goes into the crit/dodge equation...and you all arent picking up on the hints...best of luck when your banishment upgrades ;)