Our group's GM thinks that critical damage is under powered, so his home-brew rule is that critical damage just adds up. the problem is a character will often die after taking two critical hits.
I do think critical damage is normally a little under powered because it seems pretty difficult to be killed by it in one encounter, and if you survive an encounter it is pretty easy to heal up critical damage.
our GM said we could change the rules, and I want to but I don't what we should do to balance critical damage. does anyone have an Idea on how we could balance it.