@topeira: You gain stats every time you level up (+ the bonuses from armor/weapons/runes etc).
If you try to do a level 5 quest at level 30+..even if you take off all your armor you will still "overkill" an level 5 quest even if you start doing it with you fists or a level 1 sword.
so what you're saying is that in NORMAL when i level up i get buffs that increase vitality and melee damage even if i dont chose any new skill point, yet in HARD i dont NOT?Yes. In the last two difficulty levels, not only will you generally get less XP, but levelling means little more than getting additional skill points and ability to equip better gear. So, you can handicap yourself if you are so inclined.
what happens if i play on normal and then switch to hard? will the game take away some of my damage output and vitality to simulate what dps and vitality i would have had if i had played on hard from the get go?