That's odd. I use 4 pre-generated Characters in the adventure. Three of them are fighters, one dwarf (Con 20) , one human (Con 18) and one gnome (Con 16). With each level up (level 1 to 6), the gnome and the human received ~10 HPs (6-12), while the dwarvish fighter only got ~4 (2-6) . May it be that Con 20 is treated as Con 2?
