The Boundless

Name and describe the most interesting demiplane you know of
The Boundless has an eerie and mysterious quality which I rather like, though I haven't yet found a use for it. Draedenden has a fundamental appeal to me. Dungeonland is of course hilarious and fun. I also like the Demiplane of Time.

Let's go with The Boundless. This is a small demiplane, featuring crystalline isles on a large ocean. Devoid of life, all that's really here is the shore and the way you came. Drinking of the waters of The Boundless heals one on their first visit, which can last any amount of time and yet take no time outside. On the second visit, the waters rejuvenate, restoring some youth, though the realm now feels darker and more ominous. After the second visit, the demiplane seems to "hunt" past tourists in some fashion, with its color pools opening very close to you in your travels through the Ethereal as though to draw you in, and the plane itself seeming to crop up near your location when it would be difficult to avoid it. Nobody who has entered The Boundless a third time has ever emerged. The plane has a strange warden, an immortal woman who gives a few words regarding the plane and offers nothing more.