The Crimson Binome
Hero
At the extreme end, you could still play a utility wizard with no damaging spells (in order to tank your offensive CR), and then calibrate your defensive CR such that you end up as a CR 3 creature who can still cast forcecage.Well, for the min-max minded, it encourages a different sort of behavior: choosing non-proficient weapons that do the least damage possible, or spells that do no damage at all, in the hope of qualifying for a higher level and knowing they can be changed-out at a later time. To counter this, I'd require the character to be played as-is.