How to farm Menagerist Goblin and Rainbow Goblin (Diablo 3)

The Menagerist and the Rainbow Goblin was added to the 2.4.1 patch for Diablo 3, and are much sought after, due to their ability to drop cosmetic items.

The Menagerist goblin drops a pet 100 % of the time (until you have them all), and each pet will be a new one. There is a total of 19 pets, so you need 19 of this goblin to get all the pets.

The Rainbow Goblin opens a portal to Whimsydale, which is a brand new instance with the rare unique mob Princess Lilian. She drops a set of Cosmic wings, which can be used by your heroes. Read more about farming the Cosmic Wings in this article. This patch also added another set of wings, called the Falcon Wings, which you can read about here.

First of, the Rainbow or the Menagerist Goblin can only spawn in the world, not in the Vault or in Rifts! In the overworld, the spawn chance of the Menagerist Goblin is about 5 % and the Rainbow Goblin is around 3,5 %. This means that both of these are rarer than any other goblin, so expect to find a lot of other goblins before you find any of these. Added up, around each 12th goblin you find will be either a Rainbow or a Menagerist Goblin. Source for the spawn chance.

The fastest way to farm the Menagerist and Rainbow Goblin

So as we said, farm the goblins in the world. A lot of people like to combine the farming with bounties, but this is honestly a lot slower than farming strictly goblins.
The route below is one of the fastest, and is used by most people:

• Tower of the damned -> Heart of the Damned
• Tower of the Cursed
• Core of Arreat
• Royal Crypts
• Cathedral 2 -> Leoric's Passage
• Festering Woods
• Northern Highlands
• Southern Highlands -> Cave of the Moon Clan level 1+2

Once you've cleared all these areas, restart the game and begin from the drop again.
Also note that once you find a Rainbow Goblin and clear the portal, a new Rainbow Goblin in the same game will not spawn a new portal!  So if you clear Whimsydale, make a new game for another shot at the Cosmic Wings.

List of all dropable pets from the Menagerist Goblin

• Blaze
• Buddy
• Charlotte
• Galthrak the Unhinged
• Grunkk
• Haunting Hannah
• Humbart Wessel
• Lady Morthanlu
• Lamb
• Malfeasance
• Ms. Madeleine
• Overseer Lady Josephine
• Queen of the Succubi
• That Which Must Not be Named
• The Bumble
• The Mimic
• The Stomach
• Unihorn 

The pets do not drop in any order at all, so farming for a specific pet is impossible.
The patch also added the Liv Moore pet, but she is farming in a separate way. Read the guide on how to get Liv Moore.