I've always wondered what it'd be like to start with a 6 Con, because of all the "drama" and rant threads we see on these forums.
So I started an Elf Sorcerer.
And then I wanted to have the lowest possible amount of hitpoints.
So I gathered as many -Con items I could find (Bloodrage Symbiont -2 and Phantasmic masque -1), and crafted 2 one-handed weapons contradicting with my alignment for the negative levels.
I took a Monk level so I could go into Wind Stance (for an additional -2 Con).
I am currently level 9 (8 sorc/1 monk). I have trouble with traps that are difficult to avoid and spells that do unresistable damage (light spells from clerics), but other than that my character is doing just as OK as an average character.
Here's a screenshot:
I can buff myself and remove all the negative gear to get to 110-ish HP.
I bought a 3rd item that gives a negative level through Taint of Evil, but it didn't lower my HP below 9. So I'm thinking it's not possible to lower it more than 1hp/lvl.
If you have any ideas, go ahead and tell me