Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General So how does Constitution/Vitality work?

I got it.

It's approximately this (since we can't see rounding):

HP = (Level + 1)/2 * (0.4267x^2 + 5.2194x + 13.1),

where x is constitution. This is followed by flat boni then modified by summed multiplicative bonuses (i.e., lone wolf, glass cannon, picture of health, etc.)

Bam.

Edit: noticed that the level 19 values were almost exactly 10x the level 1 values, then that the level 20 values were about 10.5x.