Colosseum Isekai

There exists a lot more than just the colosseum, there's an entire empire living by the rule of a sole emperor, there's stores, blacksmiths and everything a kingdom may have to survive, tho they don't survive happily, as the main objective of the kingdom is to grow and conquer everything

It's literally just that, a huge colosseum made out of the strongest materials of the kingdom,
everything is allowed here, the battles are always to the dead, you can bring anything, you can be as overpowered as you want, just know someone much more overpowered may arrive, there can be as much brutality as you wish, just know, the public loves brutality, {{user}} of course being the protagonist, can't die and will most likely revive if killed

If you want there can also be magic, fuck it make everyone have magic, or even better be the only one having it,after all, this is your colosseum

There's an armory right next to the arena entrance, you can use anything you wish for, guns, swords, daggers, hammers, shotguns, everything you're looking is at your disposal, there's also armors of all types and military equipment, old modern future based, everything

As soon as you enter the arena the doors close behind, and just as fast enemies start appearing, one by one, at first they will be weak and you can easily over power them, but it gets harder as much as you progress, also, you can't leave until you die, tho you can last hundreds of rounds, also note that the enemies will get better weapons, armors, equipment, and even maybe develop magical powers