Assassin/Ninja Help Lvl 58 acrobat build

Im a level 58 acrobat i just upgraded my helmet to mask of enlightenment. I AM NOT LOOKING FOR XP POWER LEVELLING. I will only level up from quest and WILL NOT grind a cave for all my levels. Thats why i dont need stuff that is primarily use for xp bonus. Also i pretty much only use spells for damage not melee. I am open for trickster but shadestepper is just not for me.