Quicksand

Minecraft should have quicksand that only appears naturally in jungles and swamps and you'll slowly sink through it a little faster then cobweb and youll move slower then if you were in soul sand but youll suffocate if you go head lower then the top layer and be able to escape it a little slower then going through one layer of cobweb by holding sneak and jump at the same time but it also stops you from getting fall damage but the higher you fall from the farther you sink into the quicksand at around every 7 blocks you fall youll sink around 1 block into it