Here's your best bet: Sean K Reynolds, former Wotc designer, made an excellent analysis of this.jason_gosse said:He has said no to that in the past, and I don't think he could be talked into it. But possibly into treating augment crit as a feat that you need imp crit as a prereq and possibly some min bab
Kafkonia said:I've seen a house rule where it takes the "a doubling of a doubling is a trebling, not a quadrupling" approach.
Uhm, autoconfirming crits is a feature of a Paladin's spell "Bless weapon". Not a Bless spell cast on a weapon.Notmousse said:That's a minimum 40% of all hits if your local cleric blessed the group.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.