ElectricDragon
Explorer
The problem is the misuse of the word "retroactive" in reference to Constitution. Constitution is in no way "retroactive."
Constitution affects your current total HP and your current max HP.
Lets say you have bob the human fighter. He has 12 con, he is level 1. He had 1 HD which grants him 10 HP, for a total of 11 HP.
Bob hits level 2. Yay! He rolls his d10 HD and gets a 7. Note that he doesn't gain 8 HP this level! He gains 7! However his Constitution is giving him now 2 HP, +1 per HD.
The flaw is in the reasoning of most players in that they include their constitution bonus to the amount gained at leveling up. This isn't technically correct. The HP gained at leveling are only those from the HD. Once they have a new, higher HD total, the amount of HP granted by the Constitution bonus is higher.
If the constitution changes, then the bonus changes. However that 10 from Bob's first HD and the 7 from his second don't change.
There is nothing happening "retroactively."
Suppose Intelligence only supplies a bonus, too. And upon changing your intelligence permanently, the bonus changes, just like for your description of Constitution. Because I do believe you would use this same description if the Con gain were from a book. [A metagame description].
Retroactively, as the character's build gets stronger, every bonus for each hit die increases. There: in-game description.
I am sorry, but the two stats are important to all characters (no one just says, I'll skip using that stat: unless your DM allows players to play animals, undead, oozes, vermin, or constructs). Increases or decreases in either are game-shaking events. Why make increases in Intelligence different? I have yet to see a solid reason. Refiguring your hit points because you just got drained of 3 Con, mid-battle; is ok but down-time refiguring of skill points is a no-no? Strange.
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