|Anime • Manga|
|User||Medusa Gorgon, Death the Kid, Noah (Wrath), Crona|
|Manga Debut||Chapter 34|
|Anime Debut||Episode 34|
BREW, also known as The Tempest, is said to be the most powerful creation of Eibon and is possibly the most powerful Demon Tool within Soul Eater. It is explained by Noah that BREW and The Book of Eibon are the wisdom of Eibon — essentially Eibon himself.
In the manga, BREW is a bright cubed shaped demon tool consisting of many markings, possibly ancient writing or text.
In the anime, BREW appears differently: it is a blue cube with screws on its sides and a keyhole, foreshadowing the use of Eibon as the key to unlock its potential.
In the manga, one of the various abilities the demon tool has is Soul Amplification, in which is able to amplify the power of one's Soul Wavelength. Death the Kid unknowingly used this ability to connect one of his Lines of Sanzu.  Along with Soul Amplification, BREW also is able to merge two being into one, shown when Noah (Wrath) merged with a giant ant, increasing his power considerably.
Eight hundred years before the start of the series, BREW was located in the Lost Island and was thought to have been destroyed by an accident that annihilated the entire facility and its population along with it. This was all caused by Arachne, who wanted to erase it from that era after she collected its blueprints. This, however, was not enough to destroy Eibon's greatest creation.
A significant battle occurred between the forces of The DWMA and Arachnophobia over the possession of BREW on the Lost Island. At first, it is thought that Arachnophobia won the battle but, ultimately, it was Medusa who managed to obtain BREW.. She had Eruka and the Mizune sisters take it, unnoticed during the battle and replaced it with a fake one.
Operation: Capture Baba Yaga's Castle
Dark Side of the Moon
Noah retained BREW within the Book of Eibon. Following the death of that iteration of Noah, Gopher escaped with the Book of Eibon before Maka Albarn could retrieve it. As Noah and the Book were extension of the will of the Index, these materials were inherited by the Wrath iteration of Noah.
When Maka Albarn faced Asura during this lunar battle, she managed to slice into the Kishin and enter him. There, Maka not only found the Book of Eibon but reunited with Crona--and Maka Chopped her with that book. Crona, by that point, regained consciousness against madness. Desiring to save the world from Asura--not for that world, but because it is what Maka would want--Crona instructed Maka to find within the Book of Eibon BREW itself. While Maka followed the path of souls that Soul Eater left behind as a guide out of Asura, Crona empowered BREW from within Asura so that his Black Blood would be expelled and form a barrier around the Moon. Upon Maka and Soul's escape, this Black Blood barrier successfully wrapped around the Moon, imprisoning Asura, saving the world from the Kishin, but keeping Crona, the Book of Eibon, and BREW trapped within this Black Blood lunar barrier as well.