Moving biome

a biome thats just one gigantic passive leviathan crab/spider carrying a massive/medium sized biome on its back. like a bigger version of the coral crabs.

this creature can also have a similar function as the sea treaders in subnautica 1, where they can passively dig up stuff with their legs

also, on top, there could be smaller crabs similar to the shiver leviathan and how it has males riding on its fins. these smaller crabs can have small hills or mountains atop them.

Or a giant jellyfish with plants growing inside it. The jellyfish could be used to safely cross the trench to reach the World Tree. Large predators wouldn’t attack the jellyfish because it has stinging cells.

A biome contained within a Great Jaw. One so big it can feed on the life that flourishes on it and only needing to close its jaw once a blue moon.

It’d be really funny if it isn’t obviously a moving island too! Like it travels at a slow enough pace that it isn’t obvious it has moved until you try to find it again and realize it’s not in the same spot

Something like a slime would be cool, masive ooze creature that slowly moves around the map engulfing anything caught in the way. Being able to swim through a biom spanning leviathan neat

That would be so cool. Maybe make it move quite slow so that you might not notice at first and then you’re like, wait, how did that get over there?!