I received a question about this build recently so wanted to share my write up that reflects some changes I've made:
I changed my skills around a little bit... I now have the following real skills:
100 Archery (120 with +5 Despicable Quiver and +15 Ring)
120 Tactics
120 Anatomy
100 Chivalry
100 Spirit Speak (115 with +15 Bracelet)
100 Resist Spells
080 Focus
I am playing this build as a human. Human has natural 20 Necromancy from the Jack-of-all-trades passive. 20 Necromancy is enough to maintain Wraith form after it's been successfully cast. I have a separate suit I will switch to which has 100% Lower Reagent Cost and +40 Necromancy. I will put that on ONLY for casting Wraith form.
Once I am in Wraith Form, I switch my suit to a build that has 121 Hit Points, 115 Mana, 215 Stamina. I will use Greater Strength Potions and Trinsic Petals to get to 150 Strength which will bring me to 137 Hit Points. The most important stat here is your Stamina. You want to be able to use a Composite Bow and hit at maximum speed of 1.25 seconds per hit. You will need atleast 55 Swing Speed Increase - I get 30 from my Weapon and 25 from items.
In terms of artifacts I am using, I have the Desciple Quiver in the back slot, Cameo in the Talisman slot, Ozy Obi in the belt spot. Conjurer's garb in the Robe slot. Mythical Royal Guard boots in feet slot. Rest of suit is Bone/Studded so that I can get to the 55 LMC bonus cap.
The purpose of this build is to regenerate and leach back AS MUCH MANA AS POSSIBLE. In Wraith Form, with 37% Mana Leach on the Bow, with 100 to 120 Spirit Speak - I am leaching back an insane amount of mana. It's probably overkill. I probably should re-route some of the points I have in focus to another skill like more Chiv or Healing. I can chain Armor Ignore pretty much non-stop. If you can find the rhythm where you can chain AI like that at 1.25 ticks per hit, you're going to be doing massive damage.
The problem with this build is that Wraith form doesn't have very good movement. It's best for fights where you can stay stationary a bit. You don't have alot of natural defenses, so I don't suggest using it for solo hunting. I have generally used it for hunting in bigger groups where someone else will be tanking down the boss.