Talk:General Hux/@comment-58.7.109.212-20170831110745/@comment-454133-20180114051817

Anonymous: Dice can only be rerolled once; that's what you're remembering. But they can be modified any number of times unless an effect says otherwise (e.g. Emperor Palpatine). As long as you have more effects that can modify the dice, and you're not blocked from doing so by an effect, you can keep modifying.

So yes you can modify the set-aside hit, so far as I know. The problem is whether changing it to a crit removes its special unblockable status (as it's no longer the set-aside hit). I don't remember how TOs have been ruling on this one. You may want to ask (or search) on the FFG Rules Forum.