3d6: HP / Level

“But what about Hit Dice?”
Yes, If you remove all dice but d6’s you can no longer say this class has dX hit points while this class has dY. I have so far come up with three solutions to this. Spider only has three classes so that makes it a little easier.

1: Easy but Unfair.
Take the lesser (casting) class; assign it 1d6-2
Take the middle class; assign it 1d6
Take the greater (fighter) class; assign it 1d6+2

This option is easy to implement but severely inhibits the caster. It gives them a 50% chance of rolling a 1 on their Hit Die. The fighter on the other hand has no chance of getting less than 3.

2: Hard but Fair-er
Take the casting class; assign it 1d3
Take the middle class; assign it 1d6
Take the fighter class; assign it 1.5d6

This option requires a little more thought when rolling but spreads out the points more evenly. Caster has 33% chance for each, Fighters spread is 1, 3, 4, 6, 7, 9. I honestly like this option but I don’t think people would like to do the math for 1 ½ d6.

3: Mostly Easy and Possibly Fair
Take the casting class; assign it 1d6
Take the middle class; assign it 2d6 & take the best
Take the fighter class; assign it 3d6 & take the best

Alright, my wife came up with this and I find it the most intriguing. It’s relatively easy, requires no math, but the numbers are a little ethereal for me. (I’m no probabilitition or statition or even a spellatition) Another problem that it has is it makes char-gen difficult for characters > 1st LVL

All of these have limitations and draw-backs and the best solution may to not have hit points / level even be a function of the dice, but some static number.