Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Beta Tanks, and the problem with STR based gear.

It seems CON (along with SPD and PER) are being treated as "general" stats useful to any of the three character archetypes (warrior, rogue/survivor, wizard), whereas STR, DEX, and INT are the "primary/exclusive" stats for each of these, respectively. So it does make sense.

But if you're saying that warriors need more CON than the other two character types, remember that Way of the Warrior gives some pretty big Vitality boosts at higher levels (EDIT: 25% extra Vitality at ability level 5 - i.e. 5% x 5 levels in the ability, still called "WarriorLore" in the tooltip), so your standard warrior ends up with much higher HP than a standard survivor/wizard that way.