What is Neverland?

"That Neverland again." says Sam and along with the boys goes in. 

As they enter Devon says "Which one of you closed the door from outside?"

Confused, Fallon says "Why would we close the door?"

"I did." says Patrick "I put a spell so Ellis wouldn't come out. I knew Typhoon had come to challenge and Ellis just had a revival so… oh, he again mentioned this red moon he'll make sure you go to Neverland. So, what or where is Neverland?"

"Ellis, it must be one of the dimensions. But aren't you the ruler of all dimensions? So, shouldn't all of them be safe for you?" asks Gaby 

Ellis replies saying "Yes, but like in the underworld there are unwanted beasts and monsters who, don't really like me, other dimensions can as well. But, why is it a place that I can't come back from, that I can't understand."

Sam says "Ellis, why not ask your father, he should know."

Edward comes down and says "What do you need to ask? And what happened out there?"