The Carnival of Discord was a project proposed by the demon Leviathan and seconded by Balberith. It's function was to tempt to contentiousness, to blasphemy, argumentation and murder. It was then mothballed for reasons of infernal politics.
The traveling show was later revived and given to Johannes Cabal in order to help him gather one hundred souls for Satan, whom Cabal had made a wager with. It was then called the World Famous Cabal Brothers Carnival.
The Cabal Brothers Carnival ran for a year, as chronicled in Necromancer.