take an assasin/duelist combo for a duo-dagger/sword-melee and strike from behind. with shale in your team she will get all the attention and you are free to do a hell lot of damage. some points in poison are good too for later stages. a (concentrated) deathroot extract will stun you enemies quite often. for difficult enemies take some more poison. buffed up that way you will be a real killer. also decide how high your strength will be. the best swords require 31 strength. light armor takes 20 strength. you will get a few points in strength during the mage tower quest though. there is also a rogue ability where your cunning modifier is taken for damage calculation instead of your strength. so don´t invest all you points there.