Alright, so I have been stuck at that door at the ancient shrine for about an hour. I have lured the snake and and the bat in, checked the door. Killed them, checked the door. Nothing. Normally I wouldn't ask what to do, but I only rented the game so I want to make it as far as I can while I have it, so I'm trying to not waste time.
-So did you find anything out? -Yup, The whips on this planet hurt too..
You have to use Rico's Penguin Parade. It's a Connect skill that allows you to control an enemy for a short period of time. Charm the snake or bat first then let it follow you before you check the door.