create a mob that looks like a skeleton which has the following appearance: 'make the sunken skeleton. Appearance: Waterlogged and encrusted with barnacles, seaweed, and possibly bits of coral. Its bones might appear slightly green or brown.' and the following behavior/capabilities: 'Spawning: Shipwrecks, ocean ruins, or deep underwater in oceans and rivers.
Mechanic: Moves slower on land but is faster in water. Instead of arrows, it might throw Tridents (less powerful than a Drowned's, but still effective) or use a wooden Sword in close combat. When killed, it could drop bones, cod/salmon, or rare items like Nautilus Shells or Heart of the Sea (very rare)
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