Items
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Head
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Shoulders
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Amulet
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Torso
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Wrists
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Hands
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Waist
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Legs
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Feet
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Rings
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Weapon
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Offhand
Kanai's Cube
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The Furnace
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Nemesis Bracers
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This Build utilizes Sage's, manajuma's, Endless walk and 4 piece Jade set bonuses, combined with complimentary Legendary bonuses from Quetzalcoatl, Haunting girdle and Ring of Emptiness to endow you with some serious Elite trashing power, and the unsurpassed mobility of the Angry Chicken for some seriously fast Death Breath generation.
GEAR:
I believe the items themselves should be pretty self explanatory. You want enough Cooldown Reduction for 100% uptime of Horrify: Frightening Aspect for the 50% armor bonus. This should be obtainable through paragon and weapon. You want Haunt Damage on gear where available, and Area Damage. Other than that, its pretty standard Int, Vit, Sockets. I prefer armor over All Resists in most cases as a WD due to deminishing returns from having high Int.
CUBE:
Weapon: Since this build focuses on exclusively farming elites, there is no better option here than the massive 40% damage bonus offered by The Furnace.
Armor: No DB farming build is complete without Nemesis Bracers for obvioius reasons. More Elites = More DB. If you choose to wear Nems instead, You can put Lakumba in here.
Jewelry: Ring of Royal Grandeur is required for this build. (Unable to assign to cube)
GEMS:
Bane of the Powerful: Since our focus is on Elite mobs only, this gem offers both damage and survival.
Bane of the Trapped: This is your best choice for pure damage.
Esoteric Alteration: Really, there are a number of gems you could use for this slot. Since I play Hardcore exclusively, I would Opt for Esoteric, or Gizzard as a personal preferance.
HELM: Amethyst
CHEST/PANTS: Topaz
Paragon Priorities
Core
Movement Speed
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Primary Stat
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Vitality
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Maximum Resource
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Offense
Cooldown Reduction
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Critical Hit Chance
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Critical Hit Damage
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Attack Speed
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Defense
Armor
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Resist All
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Life
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Life Regeneration
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Utility
Area Damage
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Life on Hit
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Resource Cost Reduction
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Gold Find
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Build Guide
How To Play: Enter the rift, turn into a chicken, run until you find an elite pack, Boom,Horrify (if not up or not on CD), Soul Harvest, Locust Swarm, Haunt until dead, Loot, Chicken, Run, repeat. It really is that simple.
If you are having mana issues, you can swap Pierce the veil for Rush of Essence.
If you are finding Chicken is still on Cooldown when you are ready to move on, you can opt for more CDR on gear, or pick up Tribal Rights passive if you have plenty of damage for the torement you are farming.
Horrify Should be kept up at all times. This can be achieved by Num Locking.
If you have any questions or feedback, please comment below!
Happy Clucking Farming! 
I've been looking for a "Sage" build this season and just tried this build and got 121 DB's on my first T10 run. Takes a bit to get used to not dying but I believe, great work!