World of Kulan DM
Oh, okay.I don't have anything to increase AC at the moment, rings of protection went to melee.
You need to add 1d6 to that critica hit assuming it is steel sword. It doesn't bypass DR, but it does extra damage against Akos.
Extra damage vs Akos: 1D6 =  = 4
So that is a total of 12 damage combined. Eight points is negated by DR, and one point by your buckler (right?). That would be 3 points of damage to Akos.