As a DM, I had ideas to incorporate the standard trope of a living island. I have found the Zaratan - which I love, but is ironically too small for my needs. At "only" 80 feet across, one can easily see from one edge to the other.
I am looking for something similar: A living, moving island, though I want it to be big enough to carry one or several villages. Does such a thing exist and/or are there official ways to make the Zaratan big enough for this purpose?