StatsThis will determine what your build focus is, you may not want to spread these around too much due to the fact that
Your items and skills should focus around your stats, gaining the most from item modifiers, however you have to also keep your shortcomings in mind.
I personally found the most effective use of skills was the following:
9 in the Hurricane Tree, Avoid Final Blow at all costs (The animation is bugged and you will spend alot of time walking back because you're stuck in a wall), max speedup and increase all attributes (after lvl 20, all points to it) and rest of the points into your proficiency. You can't really go wrong with the weapon choice, although I would recomend sword personally.
Some things to think about:
Strength = raw damage, you'll find that with an attack and beserk potion while pulling off a blade storm, every piece of damage can make a difference when facing a tough foe.
Agility = defense and block, a pure agility setup with solid magic defense is probably the most defensively sound build around. Not to mention with poison setup, the high block helps keeps your combos going, and its always good to see that number go higher and higher.
Con = actually, the best part of this build in my opinion is the large mana pool, it comes in handy vs tough adversaries
Luck = don't add here, the crit is way outshined by strength and the drop increase is very easily compensated.
...(anonymous editor here) Just wanted to say Luck is not the worst stat, because stats in general are pretty inconsequential. Case in point: I finished this game easily with 40~ STR/AGI/CON, giving me 634-675 base damage, 2205/321 base health/mana, and 259+485 base defense with mostly level 26 gear(non-blue/non-gold, +2 max, regular gear) and level 1 enchantments(exceptions are my level 31 axe, and level 2 attack% which is my highest level enchantment). So, low stats and basic gear/enchantments alone are sufficient to kill end-game monsters comfortably. Add to that skills and potions such as berserk(double damage), holy light(double life, ressurection), etc. and it's overkill. If I had put all my points into strength instead of luck I would have ended up doing less overall damage(unless you plan on getting high level crit enchantments on all gear) on top of getting way less drops.
Keep in mind, with the way this game is set up, defense, block and magic defense are more powerful than life increase due to the fact that potions and life after kills seem to work with a base number rather than a %, meaning that higher quality defenses is more effecive than mass amounts. the most effective way for maximizing mana is either +mana after kills or the Con build. without a substantial amount into con, you will be eating up mana potions unless you have the +after kill mod.