Oh and you're quite welcome. :)
Humans and half orcs can be healed for 100% (and much more with items), whille wf have to take enhancements to lower the penalty.
The wf defences can be easely replicated with magical items, though the strength of the barb is weel... strength...
A barb/rogue or fighter/monk/paly combo can brute force most rooms. A healing hire/pots keep you alive
Update 14 nerfed wf even further, stripped them from many of their base immunities
if you just want to get to 20 for the chance to tr, why not :
Human monk 2/paladin2/fighter12, fill the rest up with eiter 3 classes
lay on hands in early levels,
lots of feats
talking about feats:
not in any order, dodge, mobilety, power attack, cleave, great cleave, improved critical, 3X the 2handed fighting feats, the monk stance mastery feats.
a great axe/sword/ falchion combined with cleave/greatcleave will clear any room fast up to lv 8
Just one build suggestion for a Barbarian past life. This requires buying MotU as mentioned, in this case for access to Druid. I adapted this build from a builder who would probably help out if he wasn't on a break at the moment...took a few liberties with the level order as I think getting 1 barbarian for the run speed asap is worth putting all the druid stuff off for a bit, and because I question how valuable stunning blow would be for the build in heroic levels - with all the healing you have you're going to want big groups of enemies that you cleave to death. As for how this gets the past life, 9 Barbarian/9 Druid/2 Fighter gives the Barbarian Past Life. The way the past lives work is that the original classes are alphabetical (ie equal fighter and rogue levels would be a fighter past life) and then it's by the addition to the game. Druid's the last stand-alone class added so every other class takes precedence when breaking the tie.
I've played this build on a fighter, monk, and 3 ranger past lives and can vouch for its effectiveness. You actually DO take Stunning Fist on the monk/fighter past lives but I could definitely have run without it as well. You'll be in Wolf form from level 3 on (Winter Wolf upgrade when it becomes available) and as far as enhancements I'd just concentrate on things that increase your damage or run speed. Reaving Roar isn't what it was at one point but it's still very useful, especially when you're cleaving/great cleaving and seem to always be killing something.
Alignment: Anything with Neutral somewhere in it - I'd recommend True Neutral for access to Stability gear but that's up to you
Strength............17 + levels
Dexterity...........15 (requires a +2 dex tome by level 10 - if this is a problem then 16 str/16 dex/14 wis would allow for a +1 tome instead)
Level 1 (Barbarian 1) Feat: (Human Bonus) Power Attack, Feat: (Selected) Cleave
Level 2 (Druid 1)
Level 3 (Druid 2) Feat: (Druid Bonus) Wolf Form, Feat: (Selected) Least Dragonmark of Passage
Level 4 (Druid 3) Ability Raise: Str
Level 5 (Druid 4)
Level 6 (Druid 5) Feat: (Selected) Great Cleave
Level 7 (Druid 6)
Level 8 (Druid 7) Ability Raise: Str
Level 9 (Druid 8) Feat: (Druid Bonus) Winter Wolf, Feat: (Selected) TWF
Level 10 (Fighter 1) Feat: (Fighter Bonus) iTWF
Level 11 (Druid 9)
Level 12 (Barbarian 2) Ability Raise: Str, Feat: (Selected) Improved Critical: Bludgeoning Weapons
Level 13 (Barbarian 3)
Level 14 (Fighter 2) Feat: (Fighter Bonus) gTWF
Level 15 (Barbarian 4) Feat: (Selected) Natural Fighting
Level 16 (Barbarian 5) Ability Raise: Str
Level 17 (Barbarian 6)
Level 18 (Barbarian 7) Feat: (Selected) Natural fighting
Level 19 (Barbarian 8)
Level 20 (Barbarian 9) Ability Raise: Str