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Kanai's Cube

• 

  • The Furnace

  

  Legendary Two-Handed Mace

  • Primary Stats
  • • +(39–47)–(47–59) Fire Damage
    • +3 Random Magic Properties
  • Secondary Stats
  • • Increases damage against elites by 40–50%.
    • One of 3 Magic Properties (varies)

    • +192–245 Strength

    • +192–245 Intelligence

    • +192–245 Dexterity

  The Furnace
• 

  • Tasker and Theo

  

  Legendary Gloves

  • Primary Stats
  • • Attack Speed Increased by 5.0–6.0%
    • +3 Random Magic Properties
  • Secondary Stats
  • • Increase attack speed of your pets by 40–50%.
    • One of 3 Magic Properties (varies)

    • +330–524 Dexterity

    • +330–524 Strength

    • +330–524 Intelligence

  Tasker and Theo
• 

  • Ring of Royal Grandeur

  

  Legendary Ring

  • Primary Stats
  • • Attack Speed Increased by 2.0–3.0%
    • +27–60 Life per Hit
    • +2 Random Magic Properties
  • Secondary Stats
  • • Reduces the number of items needed for set bonuses by 1 (to a minimum of 2).
    • One of 3 Magic Properties (varies)

    • +24–29 Dexterity

    • +24–29 Strength

    • +24–29 Intelligence

  Ring of Royal Grandeur

In terms of the item build, there aren't many interchangeable choices.

Depending on which is the better, you'll interchange Mask of Jeram and Tasker and Theo in your Armor Cube slot. The other 5 slots need to be used for the Helltooth Set.

On the wrists, I prefer the consistent damage from Jeram's Bracers casting Wall of Death often (especially against mobs which can't be knocked back like Rift Guardians), but a suitable option would be to use Strongarm's Bracers, which procs off your Gargantuan's attacks. You can also find Life on Hit on your bracers instead of Vitality, which will help your healing.

With rings, you want to try to get Cooldown Reduction on them, while the Ring of Royal Grandeur unfortunately has a semi wasted stat slot due to it always rolling Primary Stat/Attack Speed/Life on Hit. While there might be some breakpoints to hit for the Pets damage (I haven't tested or researched at all), it's too much to give up the Cooldown Reduction/Crit Hit/Crit Damage on the rings so it'd be better to find a Short Man's Finger and Convention of Elements with the desired Primary rolls. If you need survivability, you could swap out the Convention of Elements for a Unity (be sure to put a Unity on your follower too!). I've added The Tall Man's Finger as an option as well, you'd need to drop Convention again, and I feel it's not worth the tradeoff for a Stronger Zombie Doge unless you use the Fire rune, which doesn't help with survivability. Convention of Elements is especially useful as we have multiple elements to better make use of its power (Fire: Gargantuan, Wall of Death, Fetishes from Belt/Poison: Grasp of the Dead/Physical: Zombie Doges).

Gems: Diamond in the helm, Topazes in your Chest and Pants. As for Legendary Gems, although I'd much like to use Gogok of Swiftness as a 3rd gem, Grasp of the Dead didn't seem to proc Gogok enough. As the theme of the build is to buff Pet damage by as much as possible, I've chosen Enforcer as the 3rd gem. Esoteric Alteration is a safe defensive choice, other good choices would Zei's Stone of Vengeance or Bane of the Powerful.

Paragon Priorities

This is more of an endgame build (considering the requirements), so it is assumed you'd be Paragon 800+. Anyway you will likely find that you are a bit low on HP due to missing Vitality and Life% rolls on Helm socket, Shoulders, Bracers, Weapon and Mojo so you may need to divert Core Paragon points into Vitality after you've gotten to 25% Movement Speed.