I started a multiplayer run with my friend, and we first spawned in Delta, with the UI saying stage 3 for some reason. Upon taking the Quorium we were delivered to Aurora, but it was considered Stage 4. Enemies were level 1, I assume because of the timer still being 0 or our level being 1 as normal, but they were more plentiful and elites and rampants were more common.
The next stage was as normal aside from the previously mentioned changes, but at the end instead of the normal Quorium, there was a corrupted Quorium on Celestium. We entered it expecting to go to the final boss after going to a quiet place, but even though we took the corrupted quorium there we were brought to Purgatory instead. I believe it had considered us to loop, as enemy's levels had increased considerably. It was then that we died, so I closed the game and got the player.log.