A duels gamemode would be nice as someone who dose it a lot i see myself need to play somewhere to get that 1v1 and to combat people abusing it make it to where when someone 1v1s someone in their party no stats are added so there is no good way to boost also i think just 1v1 at first and maybe adding gamemodes overtime would be fine maybe give everyone iron armor iron/diamond sword and 10-20 golden apples and a fishing rod lava and water bucket flint and steel and a stack of blocks and a flat arena with barriers around it. Personally i think it would do well and be a great gamemode thank you for your time.