New idea 7

A new structure, namely an underwater castle, will be ruined and abandoned, appearing as a square with four small squares, four small walls, and a small castle in the center. There will also be a guard, half human, half fish, who will look like a human, except they will have a fish tail, fins on their back, and a trident. There will also be a fish that lives in the depths. It will also live in abandoned or destroyed underwater structures and will have a light to attract other fish to eat them or to illuminate the path. The new castle will also feature a new type of octopus. It will have a long maw with tentacles. It will hide in the underground underwater areas, with only its mouth visible. If something or someone is close, it will jump out and start biting and attacking with its tentacles. Loot that will appear in the castle will include hay, coal, rotten meat, iron ingots, emeralds, copper ingots, lapis lazuli, and diamonds.