Special Stages Like Mystic Realm

Does anybody know how to have a level like a normal stage with a chaos emerald at the end like in Mystic Realm?
And how do you make a sector like the temple which changes the next level?

Aah the Custom Exit linedef. It's pretty complicated. It involves using a linedef executor to change the floor height of the CE linedef's sector which results in a different map to exit to. You'll have to check the wad itself to see how it works, it's complicated.

ok thanks.

YES, I GOT IT WORKING!
You can lock it now since the problem has been solved.

You have me working