Diablo – Bul Kathos’s Wedding Band Effect

I'm currently a level 46 Wizard, and I get 21 life per point. My templar is level 45, and gets 20 life per point. However, @OrigamiRobot's is 10 per point at level 35, and @StrixVaria's is 29 at level 54.

As far as I can see, none of my equipment affects this - it is the same if I am naked. Also, I don't think class has anything to do with it.

It appears to be linear - using yours, mine, my templar's, and @OrigamiRobot's life per vitality as data points, it could be Life Per Vitality = 10 + (level - 35), with a minimum of 10.

EDIT: Confirmed - @OrigamiRobot's life per vitality at level 36 is 11, so unless something really wacky is going on, that's your formula.

Life: Yes, yes it does. This is easy to test, just toss an Amethyst into a socketed helm with no Vitality on it. Since there are no other stats or affixes on items that affect HP beyond those two, there's no need to go into more detail on the formulae here I hope.

Damage: See here for all the details, but in short: Yes, it accounts for everything that matters. The only damage boosting stats it does not take into account are bonuses to the damage of an individual skill, or increases to resource capacity or regeneration.

Protection: It includes Armor, Dodge, and Resistance, but this is new. As of patch 1.03, "Resist values will now be taken into effect when calculating the Protection comparison stat (the Protection value is an average protection estimate of all your resists)".