i think that yous should be able to buy a duel ring for your house when friends come over for a party or whatever you can duel them
I agree with non8er because that would be a lot more fun at your house than just walking around to show your friends and if it's your house you choose who will gain attmetance into your mini arena game. btw non8er means a small circle battle field thing like when you fight enemys not the whole arena in like in unicorn way.
There could be a portal of some sort where you can go in and it takes you to the special house duel arena.
You could customize it to set it to your favorite world, or add certain items to duel with, like you could choose which kind of enemy you would like to duel, and even set the rank.
You would have to buy them from the housing shop for a gold fee, the higher the rank and health, the more gold it would be.
why would you need a duel ring in your house when you can simply just go duel at the arena? So... no i dont think your idea will happen, it kinda pointless.