Right now I'm currently looking for a certain kind of demo, guide, etc., for this idea. The player runs around the main map, but accidentally runs into a monster and is transported to another map to battle. However, that monster was a representative of a group of monsters, who are now on the battlefield. If you need an example, a battle system similar to Pokemon Z, Kingdom Hearts: Chain of Memories, Dragon Quest 8, etc. Are there any useful links/ tips I can use to get that product?
This is very simple you just need to change your players loc and have the "battle field" in a different z level...

usr.loc = locate(1,1,2)