Makuta Virus

From Lego Bionicle

The Makuta Virus was a mysterious virus made by a Makuta that was responsible for weakening the Great Spirit Mata Nui enough to crash-land on the Bionicle Planet. Not much is known about the virus's characteristics or its origin, but it was found on Xia by The Shadowed One, and became the subject of a debate between Kalmah and The Shadowed One.