I apologize for butchering the name of the thing. I forgot what it’s called 
Edit: gate, not fountain 
What went wrong?
At the end of the monolith the fountain thing that spawns mobs was misplaced. It blocked the doorway so I had to walk around the map just to get to the other side of the thing.
Screenshots (via a site like imgur) or video, if applicable
https://imgur.com/a/GM0p3nn