As this custom died away, Cybertronians turned to another sport full of thrills and spilled oil: gladiatorial combat.
In the old days, after being birthed from the Well of All Sparks, the newly sparked Cybertronian was expected to make a death-defying run through Underworld as a test of courage and worthiness. In the final days before the war, Crystal City had to deal with dangerous incursions into their underlevels from creatures of the Underworld. The Underworld was a place of great mystery and danger, dark things lived there and hunted the unwary.
The unmapped, largely unexplored levels immediately below Cybertron's disused sewer system are known as Underworld, home to all sorts of horrible things.
