DND_Reborn
The High Aldwin
FWIW, our next game will use a HP adjustment at level 1 equal to your highest ability modifier. After level 1, you only get HD.I was actually thinking about this again today, and then I come here and see my thread was necroed.
Neat.
I'm thinking the 4E solution might be best. Con improves your recovery, not your base HP. So Con adds to Hit Dice rolls, but it doesn't add to HP per level. One would have to change hit dice to recover fully on a long rest, but then high con characters could recover more than their base HP over the course of a day.
I crunched the numbers on it a while back and it was reasonably close to where things were now. Monster math would need to be revised, but monster HD is mostly descriptive now so you could remove that without any loss. I might also add Con score to HP as a buffer at low levels, but I really want to do that anyway.
CON modifier will function as an exhaustion buffer (think of it as free levels before you feel the effects). Everyone at our table loves the idea of CON working with exhaustion and not HP as we don't view (much) of HP as "meat."