Ok, so here is my own build which I am using at the moment. Btw, I also found all the stuff you need for a Jade Nuke build (Jade set+Quetazotl mask or what it is called), but this seems to be quite overpowered when I tried it out (elites on T6 die in one, or two 'hits'). I prefer the build I have as it offers a lot more micromanagement.
Most important item so far: The Grin Reaper Mask. If you find it, use it. With the right skills, it boosted me 2-3 Torment levels as it is so strong. By chance, the mask turns you into a skeleton and summons two other mimics. These have basically access to all of your chosen skills (not entirely true, as they can only use part of them). The best thing about the mimics: they are not mana limited, and other limitations don't count for them as well, as e.g. the number of spider queens they can cast simultaneously. Internet says, that they use always the lower weapon damage stat (so try to get a weapon with low weapon damage as high as possible to maximise the effect of the mimics).
The Grandeur ring which decreases the set piece requirement by one (unfortunately you need still at least two parts of the set).
I also choose to use the Zuni set to keep my fetish army constantly alive. This helps especially, when I die. Because otherwise, the battles are really difficult to win as all my pets are gone.
I also choose three pieces of Jade, to get the 4 set piece bonus, which gives me some mana regen.
I have the Cord of the Sherma, which is a neat legendary belt, with a special attack that I will explain later.
As a weapon I have the devils tongue, which gives 20% elite damage and the zuni mojo in the other hand.
I also have 15% damage increase for zombie charger, and 11% increase of damage for FA.
My main stats when standing still is about 930k damage and about 14.4 million toughness.
Skills:
Spider Queen: as a primary. I spam it all the time. It doesn't really make sense, as only 1 Queen can be alive for you. But, this skill procs the mimics a lot...this is what you really want. The best thing: the mimics can cast more than one at the same time. After a few seconds, all screen is covered with spiders. And an army of spider queens does a great amount of damage.
Pirhanado: great crowd control, great damage buff of 15%. I also found the bruisers arm armour, which gives an additional damage buff to mobs caught in the Pirhanado. The mimics cast this as well, help crowd control even more.
Horrify: I like it better that mass confusion, as its cool down time is shorter. even elites are getting stunned. The rune I choose also boosts my armour considerable...so my toughness goes up to 17 or 18 million. Thus, during fighting, I have basically always this toughness. Mimics cast this to! It stuns enemies, but it does not trigger my armor.
Zombie Charger, Pile On: highest damage dealer skill of the WD imo. I also increases area damage a lot in the paragon levels and it helps a lot. Mimics spam it also and it just nukes everything. But, mana must be managed a lot. I have about 100 mana/s regen rate, so I can spam a few of those. Good thing: it combines very well with Prihanado: mobs are grouped together, just through in some Pile On nukes and everything turns into meat!
Spirit walk with health regen: saves my life and helps me to position right for the Pile On nuke.
Fetish army to get the constant fetish Zuni bonus.
Passives: Grave injustice to reduce cool down time, Pierce the Veil to increase damage by 20%. Again Fetish army...the spider queen triggers them not so much, but about 8 of them are on screen in a good battle and it helps. Bad Medicine. Bad Medicine will be explained in a second.
For my ring sockets, I choose jewellery of poison: does poison damage over time. poisoned mobs get a damage increase of 10%! This effect is triggered by spiders, mimics, horrify, fetish...basically everything, so a constant 10% damage increase. Now the reason why I choose Bad Medicine passive skill: poisoned mobs deal 20% less damage. Et voila, this combination gives a total of 10% damage increase you do and 20% damage decrease you receive as basically all mobs are poisoned on screen.
Last socket: trapped of the bane. Why does it combine so well: all crowd controlled enemies take (19%) more damage for a few seconds. As I stun enemies with Prihanado, Horrify and the special attack of my Belt (sends occasionally a chaos wave, which stuns enemies for 2 seconds) all combine such, that basically all enemies get this damage increase.
The only thing missing is Gogok legendary gem to increase my attack speed and decrease cool down time for Horrify. But it seems quite difficult to get a amulet with a socket which is good.
Playstyle: I just run in the middle of the mobs unleash Pirhanado, spam Pile On Zombies, hit Horrify and let the pets clean the rest
I all this build "The horrible but grinning Tank-Pet-Nuker"
Makes a lot of fun imo! T6 farming is easy. Grift of 28 at the moment, which I can bit with minutes left (but I am upgrading my gem atm, will test out the max Grift when I am done).
Try it out if you find a Grin Reaper mask.