After defeating the Successor in the mountains and returning to your home base in Code Vein, you’re told that you need to go under the cathedral to progress. But where exactly is that and how do you get there?
Here’s the doorway leading to the elevator. It’s already up and all you do is get in and ride it down. You can actually go down there earlier, but the door doesn’t open until after you defeat the Successor in the mountains. Here’s a better look at the map to get you there.
Once you ride the elevator down, just head through the door and you’ll be where you need to be under the cathedral.