UngeheuerLich
Legend
Depends on the game. If it is combat heavy and optimized, and the GM plays very tactically, 14 ir at least 12. In a game more about roleplaying I could imagine playing some character with con as low as 8. Coming from ADnD I am pretty used to wizards with low amounts of hp. With con 8 you have 5+3 per level which is more than enough if you play carefully.