One of the main attractions of Nightwater City is the Arena, known for its relentless fights.

The arena is a platform built, like most of the city, over a pit of blackwaters that forms an ecosystem of creatures that will devour anyone that comes near.

The rules and limits of each combat are established beforehand between the fighters according to their preferences. This makes each fight unique and exceptionally entertaining for the public, especially if you are betting.
You can bet on anything, being the death of a fighter the most common option, but also how many limbs they will lose, whether they will fall into the water and devoured vy the giant createures or not, how many rounds they will last until one of them bleeds out, and so on. The only prize for the winner is a privileged seat from which to watch the next arena, but depending on how much the viewers like the show, it is a common practice that they give money, food or other goods to the winner so they can enjoy a well-deserved rest. This way Nightwater can attract new challengers and people around the world and boost the economy of the city.