THE SECRET GROTTO
['Normally, cultivators that aren't in the 3rd realm of the cultivation realms and paths, wouldn't be able to make it into this grotto, it has had a barrier that restricted some cultivation levels from participating in it.
For the weaker cultivation realms, it is not that there is a barrier stopping them from entering per se, in their case, it is the aura of the place that scares them away. Most of them would even pass out before coming this far.
From the 3rd realm to the 5th realm, they are the ones that are usually allowed to explore the secret grotto, and then as for the cultivation realms above, there are a few chances for them to explore this place. During that time, this planet would turn into a crazy place as powerful groups and individuals from around the Omega Nebula would come here.