Kah-Gash

The Kah-Gash is a mythical "weapon" from Darren Shan's The Demonata series.

The Legend
Legend of both humans and demons says that the Kah-Gash is a weapon that has the potential to destroy the human universe and everyone in it or all the demon universes and all the demons in them. When they are combined together they form an all and powerful weapon that is potentially deadly to all.

The Disciples Search for the Kah-Gash
The Disciples, a group of mages from the series, have the ultimate goal of finding the Kah-Gash and using it to destroy the demon universes. In Demon Thief, Nadia had a vision that a piece of the Kah-Gash would soon be found. It turns out that the "piece" is Kernel Fleck. Kernel believes that he is the Kah-Gash due to the fact that he can open a window to the location of anything in any universe that he concentrates on, except something that is where he currently is, and he is unable to open a portal to the Kah-Gash.

In Demon Apocalypse, it is revealed that Grubbs Grady and Bec, the other two protagonists in the series, are also the other two pieces of the Kah-Gash. When the three of them channel their magic powers together, they are able to perform feats of magic that break all previous rules of the art, first using their power as a way to travel back through time.

At the end of Demon Apocalypse, Beranabus intends to go with Kernel and Grubbs to study more about the Kah-Gash and how to control its powers. It is assumed that the main goal for the rest of the series will be the quest to harness this power to destroy the universes of the demons. Near the end of wolf island grubbs finds out that he is probaly going to destroy his universe with the kah-Gash