Collect all 30 Golden Hoplings hidden around the Stormstout Brewery on any difficulty

Grab some of Ling-Ting's Favorite Tea, which can be purchased from Auntie Stormstout at the entrance of the dungeon. The tea is needed to see the hoplings and is only good for 5 minutes so get a few.

Press Shift+V to enable friendly name plates, this will make it easier to find the little guys.

Here are the general areas where you'll find them. The last one is under the last boss after he is killed.

Trickling Passage 3
Grain Cellar 6
Mama's Pantry 3
Stormstout Brewhall (Boss Area) 5
Stormstout Brewery 1
Stormstout Brewhall 2
Stormstout Brewery (Boss Area) 2
The Great Wheel 3
Stormstout Brewery 1
The Tasting Room (Boss Area) 4