User blog comment:Miskos3/Fairy Tail 520: Dragon or Demon, Review/@comment-29874610-20170204151505/@comment-5303512-20170205132053

We don't know what being near the temple is since we did not see any demons beside Natsu that we were unaware of at the time approach the temple.

Well Natsu and the others broke the floor of the temple that led to the cave, not a conventional way to enter another part of it don't you think? Plus there was no sacred runes or structures, etc. in the cave to show that it was part of the temple or had it's protection.

Plus if it weren't under the temple then the moon drip would not shine on Deliora, plus that entering the cave through the temple was never shown, they could have gone outside first then to the cave, plus it was shown that there was a entrance that led to the ocean.