Videos of funstuff are at the bottom.
Holy balls look at that almost 10 crit. This bow is definitely not op. I repeat, not op.
Now, if you're unfamiliar with tornado shot builds, over 35k with GMP is quite insane especially for such a fast attack speed and Vaal Pact. To reach my dps numbers (and higher) you'll need a 6L in either your Voll's or Windripper. Keep in mind you only need one 5 or 6 link as Tornado Shot is the master race and does all of your dps.
Everything I did for this spec was a rather quick slap together so the gear isn't too amazing or strict in what you use. Likewise with the spec. I felt this was the most efficient use of points to get the best clearing speed/feel and dps numbers whilst still managing to stay alive.
Even though my defenses are absolutely shite I rarely die these days due to killing everything faster than it has a chance to hit me. You can opt to build it more defensively and lose quite a lot of dps because even at 15k+ tornado you're annihilating endgame maps.
108 point Scion start build
107 point Ranger start build
A bit about the spec: Vaal pact is completely essential at high dps levels (20k+) and most of the crit passives are highly recommended. The aura passives are also essential to be able to run anger/wrath/herald of ice/herald of thunder and as they are the source of most of your damage buffing them is a good idea. You can always trade some damage passives and grab Acrobatics or extra evasion, life, whatever else. I'm happy with my 3700 life and 1 shot killing abilities atm so I haven't felt the need to.
My gear is pretty decent at this stage and with the master system getting similar gear isn't too much of a challenge. Alpha's Howl is essential to running all 4 of our buffs and helps boost the damage of Anger/Wrath. Accuracy on gear is hardly needed but I recommend a high amount on 1 piece, though not essential since you get a lot from the passives/dext.
The Voll's was a recent addition and I love it. I was wearing a tabula up until about 86 so I didn't feel a loss of defense, only a gain of 25% crit. You can of course choose to wear a sturdy rare chest to up your defenses, entirely up to you. Getting the right colours for Tornado Shot on a 6L is way easier on a Voll's though which is something to note. Atziri flask is recommended since it gives a nice dps boost and helps kill ele resistant mobs quite a lot.
Try to get high WED everywhere you can as well as crit. So crit rings with WED/life are ideal but make sure you're getting sufficient resists too. Your quiver should have attack speed, WED and hopefully be crit based with crit on it too. Life & crit multi are good bonuses here.
You can easily wear a large amount of mf and turn this into a MF spec. You'll probably sacrifice a few thousand dps but not much else. My crit and dps for the most part is from the passives and the bow. I clear virtually every map level and mod quite comfortably as you will see in the videos so this spec with reduced dps can still melt through lower level maps or lunaris farming.
Gems:For your Tornado Shot the essentials are Tornado Shot, Blood Magic, Life Leech or Life on Hit (if you don't have over 15-20k dps), GMP. After which you will get Weapon Elemental Damage and then Critical Damage. That said I don't recommend playing it without at least a 5L. Both WED and Crit damage are such a large dps gain that to not use them is very brutal.
Bandits: Passive point, Kraityn (8 AS), Alira (Power charge).
Leveling:Leveling was quite comfortable, especially if you use some of the rings/amulets with reduced mana cost from Elreon. Grab a Stormcloud unique bow at lvl 12 and use it with Wrath or Anger up until you can get Herald of Ice/Thunder and then use 1 of those as well. Aim to get to the aura nodes early on to start using more auras/heralds and linking a reduced mana. Once you swap into Blood Magic it's a good idea to use either Thief's Torment ring while leveling or Life Gain on Hit gem with quality.
I used LoH up until I was breaking maybe 15k dps with tornado shot and it's perfectly fine up to that point. Once you start hitting higher dps numbers you'll want to move to Vaal Pact with Life Leech.
Once I reached enough crit levels from passives I swapped to a Death's Harp ( around lvl 40 ) and used it up to 70ish when I put on Windripper. Death's Harp is an amazing bow for a budget version of the build.
For maps I was doing levels 80-89 within an hour each. It was completely absurd as I was clearing 75-78 maps in 5 minutes a piece on average.
Reflect:Get your light/fire res up to respectable levels and you'll be fine with vaal pact/life leech. A light/fire flask help when you shoot into it but isn't necessary when you're capped/near capped. An Atziri flask helps greatly as well since it adds an extra source of damage and leech which doesn't reflect during its duration.
Grouping: With the 2 dps auras you provide some damage support for those you group with. That said, who cares because you're going to be completely carrying your friends on your mighty muscly back with this spec. At my dps I can comfortably carry 1-2 people without noticing much or any difference in clear speed. From level 80+ I often opened a public party and let a person tag along in my 75+ maps because it's not any slower and they could tank for me, or something, it was just for fun.
77 Shrine with fast clear and discussion of build.
Videos below here are from before 1.2 and using Split Arrow.
Double courtyard boss 78 map, elemental equil, fire res, -max, etc:
Typical fast map clear, a 77 shipyard:
Insane 78 map noone has any business even entering but why not:
Death and Taxes unique 75 map
Will add more videos as I play/can be bothered thinking of something. Can take request too possibly.