hmmm
Frost giant cr 9.
Frost giant with barbarian levels of 12 or higher are able to take epic feats.
A frost giant with assuming 20 levels in barbarian would have 7 feats total.
4 normal 3 possible epic.
power attack, cleave, great cleave, improved critical, weapon focus (whatever weapon they use)
Epic feats: overwhelming critical, devastating critical.
devastating critical- on a critical attack, a fort save of 10+1/2 level +str modifier. DC is 20+ str modifier
overwhelming critical- on a successful hit, weapon deals an extra 1d6, if the weapon crit is x3, the extra damage is 2d6. If the weapon is x4, the extra damage is 3d6.
So assume a 20th level barbarian frost giant, raging, using a greatsword, with improved crit, dealing 2d8 (huge great sword) +str mod *1.5 +magic enhancements. on a crit, add 1d6 damage and a fortsave of dc 20 +str modifier or die.
nasty combination for the higher echelon of the frost giants. hehe