infinite hallway dimension

you could try making a structure(s) that only only generate at a specific x and y coordinate and make the dimension a super flat

or mess with cave generation to make caves that look like a hall

please tell me what ends up working because I may end up using it for a dungeon

Try making a really long hallway, then when the player is close to one end, teleport them to the other end.

you could also you the immersive portals mod if you wanted to have other entities, but then you or the enemy could loop back to get to the other. you could also use a variable to determine how any times the player's been through the teleported if you do that.

https://mcreator.net/forum/100126/infinite-hallwaylong-hallway-tutorial

This is a link to a tutorial I made a while ago