It seems to me now that I am playing an all Lizardmen party. That they seem to
take less damage and do not tireout as quickly as other races. I just fought a
group of level 11 jugernaunts and my party is at level 9. When they "Jugernauts"
hit they only did 4 to 8 points of damage. seems in other parties they did like
15 points of damage. Also my priest has rest all spell and has used it just once
or twice the whole game.

I guess that is all Vitality. Check the manual entry for vitality or it might also have the same verbiage if you right click the attribute.

Juggernauts tend to get criticals a lot normally, (hitting for 2x or 3x) which is why they hurt so much. I wonder if they are getting less criticals against you, and if so whether vitality or stamina has anything to do with the likelihood of an enemy getting a critical on you.

What classes are your Lizards?

Ranger, fighter, valk up front and a Mage and priest
in the center. The juggernaunts attacked my mage
once and got 3 hits and still only did 4-8 points
of damage per hit.