Strength = ups Attack , and it is how much you can carry

Stamina = raises up your hit points , and under some tests it raises Stun resistance

Agility = raises Armor class , and your general ability to evade attacks

Intelagance = Raises mana pool for mag/nec/wiz/enc/shd , also fizzle rates are improved upon

Wisdom = Raises mana pool for all other non silk wearing classes and fizzle rates are improved upon

Resists = Resists varys , mostly resists are based on levels the resist numbers are what helps you out aginst a spell being cast on you.