Power / MM / Conditions necro leveling
15 points blood and 10 in the next trait up for faster staff recharge + toughness is pretty strong. Against melee monsters you can put all your marks down, then pull them through with scepter or something and they take a big burst from marks, then your life siphon negates most of the small amount of damage that most monsters will do.
MM is okay when you get flesh golem.