The Iron Colosseum, also known as the Arena of Death, is a massive structure built outside the capital city of the Vache Kingdom. The colosseum was constructed with iron from the Nagan Empire, which the Vache Kingdom had won its independence from. The colosseum is considered one of the most magnificent and terrifying structures in the kingdom, and is used primarily for gladiatorial games and other blood sports.

The games held at the Iron Colosseum attract spectators from all over the kingdom and beyond. The aristocrats who own and operate the colosseum spare no expense in ensuring that the games are spectacular, with elaborate sets and costumes, and highly trained gladiators and beasts. The games are held regularly, with different events and themes, such as "Beast Battles," "Chariot Races," "Gladitorial Games," and more.

The most popular event held at the colosseum is the Gladitorial Games. The games feature highly trained and skilled warriors, who fight to the death with a variety of weapons and tactics. The warriors are often slaves, prisoners, or debtors who have been forced to fight for their lives, and the spectators bet on the outcome of the battles.

The Iron Colosseum also hosts many other events, such as animal fights, reenactments of famous battles, and even public executions. The colosseum is a place of great entertainment, but also of great cruelty and suffering. It is said that the screams of the dying gladiators and animals can be heard for miles around the colosseum.

Despite the widespread disgust and outrage that some citizens of the Vache Kingdom feel towards the Iron Colosseum, it remains a popular attraction for those who seek excitement and bloodshed. It is also a source of great wealth and power for the aristocrats who own it, as they profit greatly from the gambling and ticket sales associated with the games.