Sewer derby

Sewer derbys are incredibly dangerous demolition derbies that take place in the sewers of Gapachon. They typically consist of a "tunnel-load" of 15 sewerblader mechs and their respective pilots. The object of the game is to ride through the sewers at great speed, particularly at parts that intersect with multiple tunnels, and smash into the other contestants until only one operational mech remains in the game. All types of weapon and magic are prohibited - ramming and feints are the only permitted methods of damaging other vehicles.

By tradition, the front of sewerbladers are fitted with panels of sluranium (those without sluranium panels are not permitted to enter). The winner of the race receives a heavy lump of "sewerwrought sluranium", taken from the defeated contestants, melted into a blob in a furnace and vigorously launched a thte chest of the winning mech, which then wears the resulting clump in place of a panel. Often, races take place that only allow those with sewerwrought blobs on their mechs to compete.