Monster Lab

The  was originally released as a Haunted Hollow (farm) exclusive Animal Pen in FarmVille.

It allows the storing and breeding of monsters. It requires 10 Thunder Clouds, 10  Rusty Posts and 10  Rusty Gears, to be fully constructed and usable. It can be purchased in the Market for, or it can be purchased fully built for. After finishing building you get 1 monster serum as reward for completing the.