I like your videos on the purge base set up, and OwDo Gaming. I created my own purge base like an arena with banners, lights for night games and a row of cheerleaders. Good fun.
16:55 it's a door and not look like a door like you said.. you just need to find the lever to put on the lever slot on the ground to open that door... inside is a mini dungeon within a dungeon where there are only a few spiders inside and a couple of armor recipes inside...