Honestly I found Wits to be fairly unimportant all things considered. You really can only afford it if your going down a single tree and that tree isn't magic.

Though Con's only issue is that it raises Vitality in a game where armor values exceed it greatly and where losing your armor is a HUGE no-no and where having an enemy get a free round of attack on a person without armor USUALLY spells instant death regardless of constitution.

If Con had a minor effect on armor and magic armor it would be better. It doesn't need to be greater than Strength and Intelligence... But if it was 1.5% or 2% per point than good.

Hmm but that would probably kill cross classes the ONE think this game does WAAAAY better than the first game... So like 1%?

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As for "Being without armor means you get CC'd to death."

Depends on the round. If you can survive the first round and maybe the second... enemies usually get their worst CC attacks on cooldown. Plus some enemies have no strong CC (Pyromancers for example) OR have CC that ignores armor (Cryomancers for example :P)