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This build follows the basic pet build, and thus, the pet build items. Taskers and a MoJ will really make this build shine. Though the build can function without them, they will definitely make doing T6 a joke.

Amulets - This slot is basically open for whatever you can get. Any element absorb ammy is ideal. Other decent replacements are the Hellfire Amulet or maybe an Ess of Johan.

Set pieces - This build is also using the Zunimassa set, as the damage mitigation from the 4 piece bonus is groovy. The 2 piece makes this build safer to use in higher difficulties as there is a wall of fetish always around.(and lets not forget those zombie dogs, folks!) If you decide to go for 6 piece, you can use the string of skulls, this will also boost the damage of your Fetish Army, which will always be there, so it's a pretty tasty addition. The 6 piece will also play in nicely, since the only skills you'll be using are spenders. Otherwise, I'd recommend the Aughild 2 piece for the 3 piece bonus (using a RoRG) for that extra toughness. You can't really beat that mitigation in those 2 slots in a build like this, so I'd strongly recommend that. That covers basically all of the other gear pieces aside from rings, which are straight forward, as you need the RoRG and Pox.

Belt - The Belt of Transcendence is a pretty tasty new item, I'm not sure if many have picked up on it. This belt summons fetish whenever you hit with Spirit Barrage or Haunt, both of which also stack up your Taeguk, which indeed is also pretty tasty. This also replaces your need for sycophant passive, which allows you to put on Jungle Fortitude, making you and your pets that much harder to kill.

Offhand - As I've stated above, you're mostly looking for a Zuni String of Skulls to maximize your damage output, but if you're looking for sustain damage and toughness, you could also go for a Uhkapian Serpent. The legendary bonus on the US paired with the Zuni 4 piece will probably be pretty insane toughness.

Weapon - I haven't fully tested both, but either the Burning Axe of Sankis, or the Devastator. (which is crafted, I'd recommend making an ancient one as soon as possible until you get an ancient Burning Axe if that's what you're going for.) Otherwise, really whatever you can get... any 1 hander that's ancient should do nicely, as you don't have very many important cooldowns to worry about, so the SMK isn't required.

Gems - With a pet build comes the pet gem, Enforcer. This is straight forward and requires no explanation. Taeguk is a great gem for this build. Stacking damage, and at rank 25, armor, lets you channel Spirit Barrage in many an occasion and do very nice damage, especially because this damage translates into your fetish. The armor you get on your gear = armor you get while standing still. The third gem I've been playing around with, and so far as I can tell you can use whatever you're comfortable with, as long as it's not something that procs while being close to something. (i.e. Wreath of Lightning, Bane of the Trapped cold aura) What I've been toying with are the Efficacious Toxin, at 25 that extra damage boost is nice, Zei's stone, because most of the time if you can stand a bit further back, you're standing in safety, so you'll be doing a bit more damage that way. So far those 2 seem pretty good choices, but as you play the build, your play style may support different gems such as the Pain Enhancer, or if you're running rifts or other such things, the Bane of the Powerful.

Paragon Priorities

Core - I tend to not worry about movement speed so much... but if you're gonna use it, put your earlier points into it. Otherwise I usually drop points into int/vit evenly. Resource is more or less useless, so max it out if you have the levels, otherwise don't stress yourself too much.

Offense - There is some debate whether or not the AS is necessary at the start. Cooldowns are more or less wasted points as there isn't really anything you need here, since you're only using 2 skills to summon pets at the start, then not worrying about those buttons so much until you hit a really nasty pack. CC/CD can be interchanged depending on what you're lacking. If you're using a ceremonial knife / sword or a dagger, I suppose you can go right into CC/CD depending on what you need.

Defense - Armor is king on this build, since Taeguk increases your toughness the more stacks you have. Life regen is always a bonus if you need to run away and gain some health back (you could also use the wildebeast gem if you want to stack this up a bit, since the 3rd gem is basically open for what you want to use.) Followed by life, life is always good, no? And last but not least you can start stacking that AR up even more. This is not QUITE as important since you're an int based class, and they have the benefit of gaining AR as the gain more int.

Utility - Aside from the LoH and cost reduction, personally I think this is a waste of paragon points. Since you have to spend them, max LoH first. Cost reduction will be next, since the less you spend, the faster you can gain mana back, ultimately making you cast Spirit Barrage for free due to Rush of Essence. Then go for area damage, this will actually help kill trash mobs faster while using Spirit Barrage, but after you get your fetish, they turn into trash clearers. Unless you're a broke fool, max out gold find last. If you need it, max it third.