Precursor Spawner

Precursor Spawner is a device that spits out hostile monsters. The type of monsters is determined by contents of Capture Pod that you place inside the spawner. Non-capturable monsters are not spawnable.

These monsters don't drop anything (even brains) except fake Skittles. Therefore the Spawner can't be used for farming. However, these monsters can be captured, so you can use the Spawner to obtain multiple Capture Pods with the same monster.

Creation of each monster consumes some Beer (which is used as fuel). However, when the monster is defeated, approximately the same amount of Beer spills back to the ground. That might suggest that these monsters are actually made from Beer.