|whoa lmao how did i not notice this until now?|
oh... so that locked door that I can get to now, that IS the boss door. there's actually another pillar door beneath that I missed somehow, leading to a room with the last chest in the temple.
at first Morpheel is like no threat... if you swim or walk within range of its tentacles, it'll grab you and chew you up... but you can easily stay a safe distance away and clawshot its eyeball which is always floating around through the tentacles.. I only got low health because i'm high and it took me a while to realize this.
2nd phase it comes out of the ground and reveals itself to be a giant monstrous eel like thing.. those tentacles are only on its face... and its keeping its eyeball on its face now and swimming around..
so I guess technically it can't see below itself right? so I can safely stay down hear and look for some hearts?