I just looked back at the Fairy Kingdom entry in the wiki and I read that some of the laws of physics in this zones are altered. However, it doesn't give any more information than that. This thread here is for you to post your theories on what kind of changes in the laws of physics happens when you enter the kingdom. In addition, I haven't read anything on how Sunfall Thicket or any other sub-zone of the kingdom is accessed. I assume it's via the portals, but more information could help.

I think phasing is one. It is probably in relation to the types of fairies you encounter. For example, mist and canopy fairies both have different abilities which they probably learned due to the area they live in.