The Brew of Bats is a throwable potion that will cause explode into a swarm of bats, causing all creatures and players in the area of effect to be momentarily stunned.
The Brew of Thorns is created in a kettle using the recipe found in the book Witchcraft: Brews & Infusions. Into the pot, throw a Concentrated Bat Ball, Wool of Bat, an Apple, Sugar, a Fermented Spider Eye and Gunpowder.

Wear a Witches Hat (and/or robes) while brewing to get more brews than just three.