an aquatic biome only found in trenches or a new structure "flooded city"
Sculk now acts different when in water (there's no aqua veins), sculk turns into aquasculk, which is purple instead of blue, which is to make the area look dark since red is the first color to go. Sculk catalysts act the same, shriekers are now bellowers and have way bigger shockwaves and are lower pitched but louder, and sensors are now serene stalk.
Sculk bramble is exclusive to aquasculk, it is a type of tree that grows in water, not to be confused with mangrove trees, it only grows in deep water and has bramble branches that deal 1.5 hearts of damage per second in it. Sculk bramble adds a new wood varient called lull wood, which is light blue for the bright shading and purple for the dark shading, and can be used as an alternative for wool.
Serene stalk will replace sculk sensors, which will only detect movement of swimming, so if you are moving in water but not swimming, it doesn't hear it, but if you are swimming, it hears it.
The warden of the sea, it can still not see but it uses echolocation, so it's basically a reaper leviathan from Subnautica; if you hear its voice, you're done. It is more of an angler fish than a serpent, it uses its light (which looks like a glow squid) to attract prey (fish, guardians, players, etc.), but you should know better to NOT follow the light. It has 2 attacks, the first I'll talk about is the roar, it roars to intimidate and weaken; giving mining fatigue and darkness. The other attack is biting, one unique thing is if you don't have any armor equiped, it will insta-kill you, no matter how much health you have, you will die instantly because it doesn't bite this time, it instead eats you whole. When searching for prey, its little "stars" disappear to blend in with the sculk, but when it catches its prey, the lights appear again. Its speed when calm/searching is the same as player swimming, luring speed is close to crouching, chasing in water is slightly slower than swimming with Depth Strider III, and chasing on land is the same as a turtle on land. health: 600 hp/ 300 hearts
ONCE IT CHASES YOU, IT WON'T STOP UNTIL IT GETS YOU, EVEN IF YOUR ON LAND