She drops a set of Cosmic wings, which can be used by your heroes. The Rainbow Goblin opens a portal to Whimsydale, which is a brand new instance with the rare unique mob Princess Lilian. There is a total of 19 pets, so you need 19 of this goblin to get all the pets. The Menagerist goblin drops a pet 100 % of the time (until you have them all), and each pet will be a new one. 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.
