Anyways, I really like this idea, and it has some serious potential ... but I need to do some world development will ya'll.
What I know about this world:
The pitch of this world is it's ruler - the Eternal Queen. I don't know if she rules the entire world, or just a portion, but she is so called because she seems to be eternal. She goes through fifty year cycles where she'll get older and older until death starts to knock at her door and she simply disappears. At the end of the cycle, she will reappear somewhere at the age ten. She can disappear at any time in those fifty years, but she always reappears at the end of them.
As a child, she appears as pictured above.
No one knows where she goes when she disappears save for herself, and she's not telling anyone. (I happen to know, but I won't say where. Hint: I'm heavily inspired by Narnia in many books.)
Some cycles she will marry, and her husband is called the Mortal King. Her children hold no special title, but their names are all recorded in a special book, and she will often set them and their descendants as governors of farther corners of her world where it is harder for them to travel.
And that's all I know, and I give it over to you. Just comment below with some facet of culture, a bit of physics, a new species of animal or plant. Have fun! You may come back and comment as often as you like, just make sure you wait until someone else has posted and don't contradict anyone if you can help it. (I'll understand if you both post at the same time and I haven't approved the one before yet! If that happens I'll just publish them both and decide later which one I'll use.)
(Each comment that abides by the rules will qualify as an entry to the giveaway)