A mind bomb (m) is a keg containing one to four pints of Mature wmb. It's made by using a calquat keg with a finished barrel of ale after brewing Wizard's mind bomb and randomly getting a mature batch. The brewing process makes 8 pints of ale, which is enough for two full kegs. The keg can be directly drunk and has the exact same effects as drinking a glass of Mature wmb. Beer glasses can also be used on the keg, putting one of the pints into the glass. A glass of Mature wmb can't be put in back into the keg after coming out.